1 /* 2 * services/authzone.c - authoritative zone that is locally hosted. 3 * 4 * Copyright (c) 2017, NLnet Labs. All rights reserved. 5 * 6 * This software is open source. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 15 * Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * Neither the name of the NLNET LABS nor the names of its contributors may 20 * be used to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /** 37 * \file 38 * 39 * This file contains the functions for an authority zone. This zone 40 * is queried by the iterator, just like a stub or forward zone, but then 41 * the data is locally held. 42 */ 43 44 #include "config.h" 45 #include "services/authzone.h" 46 #include "util/data/dname.h" 47 #include "util/data/msgparse.h" 48 #include "util/data/msgreply.h" 49 #include "util/data/msgencode.h" 50 #include "util/data/packed_rrset.h" 51 #include "util/regional.h" 52 #include "util/net_help.h" 53 #include "util/netevent.h" 54 #include "util/config_file.h" 55 #include "util/log.h" 56 #include "util/module.h" 57 #include "util/random.h" 58 #include "services/cache/dns.h" 59 #include "services/outside_network.h" 60 #include "services/listen_dnsport.h" 61 #include "services/mesh.h" 62 #include "sldns/rrdef.h" 63 #include "sldns/pkthdr.h" 64 #include "sldns/sbuffer.h" 65 #include "sldns/str2wire.h" 66 #include "sldns/wire2str.h" 67 #include "sldns/parseutil.h" 68 #include "sldns/keyraw.h" 69 #include "validator/val_nsec3.h" 70 #include "validator/val_nsec.h" 71 #include "validator/val_secalgo.h" 72 #include "validator/val_sigcrypt.h" 73 #include "validator/val_anchor.h" 74 #include "validator/val_utils.h" 75 #include <ctype.h> 76 77 /** bytes to use for NSEC3 hash buffer. 20 for sha1 */ 78 #define N3HASHBUFLEN 32 79 /** max number of CNAMEs we are willing to follow (in one answer) */ 80 #define MAX_CNAME_CHAIN 8 81 /** timeout for probe packets for SOA */ 82 #define AUTH_PROBE_TIMEOUT 100 /* msec */ 83 /** when to stop with SOA probes (when exponential timeouts exceed this) */ 84 #define AUTH_PROBE_TIMEOUT_STOP 1000 /* msec */ 85 /* auth transfer timeout for TCP connections, in msec */ 86 #define AUTH_TRANSFER_TIMEOUT 10000 /* msec */ 87 /* auth transfer max backoff for failed transfers and probes */ 88 #define AUTH_TRANSFER_MAX_BACKOFF 86400 /* sec */ 89 /* auth http port number */ 90 #define AUTH_HTTP_PORT 80 91 /* auth https port number */ 92 #define AUTH_HTTPS_PORT 443 93 /* max depth for nested $INCLUDEs */ 94 #define MAX_INCLUDE_DEPTH 10 95 /** number of timeouts before we fallback from IXFR to AXFR, 96 * because some versions of servers (eg. dnsmasq) drop IXFR packets. */ 97 #define NUM_TIMEOUTS_FALLBACK_IXFR 3 98 99 /** pick up nextprobe task to start waiting to perform transfer actions */ 100 static void xfr_set_timeout(struct auth_xfer* xfr, struct module_env* env, 101 int failure, int lookup_only); 102 /** move to sending the probe packets, next if fails. task_probe */ 103 static void xfr_probe_send_or_end(struct auth_xfer* xfr, 104 struct module_env* env); 105 /** pick up probe task with specified(or NULL) destination first, 106 * or transfer task if nothing to probe, or false if already in progress */ 107 static int xfr_start_probe(struct auth_xfer* xfr, struct module_env* env, 108 struct auth_master* spec); 109 /** delete xfer structure (not its tree entry) */ 110 static void auth_xfer_delete(struct auth_xfer* xfr); 111 112 /** create new dns_msg */ 113 static struct dns_msg* 114 msg_create(struct regional* region, struct query_info* qinfo) 115 { 116 struct dns_msg* msg = (struct dns_msg*)regional_alloc(region, 117 sizeof(struct dns_msg)); 118 if(!msg) 119 return NULL; 120 msg->qinfo.qname = regional_alloc_init(region, qinfo->qname, 121 qinfo->qname_len); 122 if(!msg->qinfo.qname) 123 return NULL; 124 msg->qinfo.qname_len = qinfo->qname_len; 125 msg->qinfo.qtype = qinfo->qtype; 126 msg->qinfo.qclass = qinfo->qclass; 127 msg->qinfo.local_alias = NULL; 128 /* non-packed reply_info, because it needs to grow the array */ 129 msg->rep = (struct reply_info*)regional_alloc_zero(region, 130 sizeof(struct reply_info)-sizeof(struct rrset_ref)); 131 if(!msg->rep) 132 return NULL; 133 msg->rep->flags = (uint16_t)(BIT_QR | BIT_AA); 134 msg->rep->authoritative = 1; 135 msg->rep->reason_bogus = LDNS_EDE_NONE; 136 msg->rep->qdcount = 1; 137 /* rrsets is NULL, no rrsets yet */ 138 return msg; 139 } 140 141 /** grow rrset array by one in msg */ 142 static int 143 msg_grow_array(struct regional* region, struct dns_msg* msg) 144 { 145 if(msg->rep->rrsets == NULL) { 146 msg->rep->rrsets = regional_alloc_zero(region, 147 sizeof(struct ub_packed_rrset_key*)*(msg->rep->rrset_count+1)); 148 if(!msg->rep->rrsets) 149 return 0; 150 } else { 151 struct ub_packed_rrset_key** rrsets_old = msg->rep->rrsets; 152 msg->rep->rrsets = regional_alloc_zero(region, 153 sizeof(struct ub_packed_rrset_key*)*(msg->rep->rrset_count+1)); 154 if(!msg->rep->rrsets) 155 return 0; 156 memmove(msg->rep->rrsets, rrsets_old, 157 sizeof(struct ub_packed_rrset_key*)*msg->rep->rrset_count); 158 } 159 return 1; 160 } 161 162 /** get ttl of rrset */ 163 static time_t 164 get_rrset_ttl(struct ub_packed_rrset_key* k) 165 { 166 struct packed_rrset_data* d = (struct packed_rrset_data*) 167 k->entry.data; 168 return d->ttl; 169 } 170 171 /** Copy rrset into region from domain-datanode and packet rrset */ 172 static struct ub_packed_rrset_key* 173 auth_packed_rrset_copy_region(struct auth_zone* z, struct auth_data* node, 174 struct auth_rrset* rrset, struct regional* region, time_t adjust) 175 { 176 struct ub_packed_rrset_key key; 177 memset(&key, 0, sizeof(key)); 178 key.entry.key = &key; 179 key.entry.data = rrset->data; 180 key.rk.dname = node->name; 181 key.rk.dname_len = node->namelen; 182 key.rk.type = htons(rrset->type); 183 key.rk.rrset_class = htons(z->dclass); 184 key.entry.hash = rrset_key_hash(&key.rk); 185 return packed_rrset_copy_region(&key, region, adjust); 186 } 187 188 /** fix up msg->rep TTL and prefetch ttl */ 189 static void 190 msg_ttl(struct dns_msg* msg) 191 { 192 if(msg->rep->rrset_count == 0) return; 193 if(msg->rep->rrset_count == 1) { 194 msg->rep->ttl = get_rrset_ttl(msg->rep->rrsets[0]); 195 msg->rep->prefetch_ttl = PREFETCH_TTL_CALC(msg->rep->ttl); 196 msg->rep->serve_expired_ttl = msg->rep->ttl + SERVE_EXPIRED_TTL; 197 } else if(get_rrset_ttl(msg->rep->rrsets[msg->rep->rrset_count-1]) < 198 msg->rep->ttl) { 199 msg->rep->ttl = get_rrset_ttl(msg->rep->rrsets[ 200 msg->rep->rrset_count-1]); 201 msg->rep->prefetch_ttl = PREFETCH_TTL_CALC(msg->rep->ttl); 202 msg->rep->serve_expired_ttl = msg->rep->ttl + SERVE_EXPIRED_TTL; 203 } 204 } 205 206 /** see if rrset is a duplicate in the answer message */ 207 static int 208 msg_rrset_duplicate(struct dns_msg* msg, uint8_t* nm, size_t nmlen, 209 uint16_t type, uint16_t dclass) 210 { 211 size_t i; 212 for(i=0; i<msg->rep->rrset_count; i++) { 213 struct ub_packed_rrset_key* k = msg->rep->rrsets[i]; 214 if(ntohs(k->rk.type) == type && k->rk.dname_len == nmlen && 215 ntohs(k->rk.rrset_class) == dclass && 216 query_dname_compare(k->rk.dname, nm) == 0) 217 return 1; 218 } 219 return 0; 220 } 221 222 /** add rrset to answer section (no auth, add rrsets yet) */ 223 static int 224 msg_add_rrset_an(struct auth_zone* z, struct regional* region, 225 struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset) 226 { 227 log_assert(msg->rep->ns_numrrsets == 0); 228 log_assert(msg->rep->ar_numrrsets == 0); 229 if(!rrset || !node) 230 return 1; 231 if(msg_rrset_duplicate(msg, node->name, node->namelen, rrset->type, 232 z->dclass)) 233 return 1; 234 /* grow array */ 235 if(!msg_grow_array(region, msg)) 236 return 0; 237 /* copy it */ 238 if(!(msg->rep->rrsets[msg->rep->rrset_count] = 239 auth_packed_rrset_copy_region(z, node, rrset, region, 0))) 240 return 0; 241 msg->rep->rrset_count++; 242 msg->rep->an_numrrsets++; 243 msg_ttl(msg); 244 return 1; 245 } 246 247 /** add rrset to authority section (no additional section rrsets yet) */ 248 static int 249 msg_add_rrset_ns(struct auth_zone* z, struct regional* region, 250 struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset) 251 { 252 log_assert(msg->rep->ar_numrrsets == 0); 253 if(!rrset || !node) 254 return 1; 255 if(msg_rrset_duplicate(msg, node->name, node->namelen, rrset->type, 256 z->dclass)) 257 return 1; 258 /* grow array */ 259 if(!msg_grow_array(region, msg)) 260 return 0; 261 /* copy it */ 262 if(!(msg->rep->rrsets[msg->rep->rrset_count] = 263 auth_packed_rrset_copy_region(z, node, rrset, region, 0))) 264 return 0; 265 msg->rep->rrset_count++; 266 msg->rep->ns_numrrsets++; 267 msg_ttl(msg); 268 return 1; 269 } 270 271 /** add rrset to additional section */ 272 static int 273 msg_add_rrset_ar(struct auth_zone* z, struct regional* region, 274 struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset) 275 { 276 if(!rrset || !node) 277 return 1; 278 if(msg_rrset_duplicate(msg, node->name, node->namelen, rrset->type, 279 z->dclass)) 280 return 1; 281 /* grow array */ 282 if(!msg_grow_array(region, msg)) 283 return 0; 284 /* copy it */ 285 if(!(msg->rep->rrsets[msg->rep->rrset_count] = 286 auth_packed_rrset_copy_region(z, node, rrset, region, 0))) 287 return 0; 288 msg->rep->rrset_count++; 289 msg->rep->ar_numrrsets++; 290 msg_ttl(msg); 291 return 1; 292 } 293 294 struct auth_zones* auth_zones_create(void) 295 { 296 struct auth_zones* az = (struct auth_zones*)calloc(1, sizeof(*az)); 297 if(!az) { 298 log_err("out of memory"); 299 return NULL; 300 } 301 rbtree_init(&az->ztree, &auth_zone_cmp); 302 rbtree_init(&az->xtree, &auth_xfer_cmp); 303 lock_rw_init(&az->lock); 304 lock_protect(&az->lock, &az->ztree, sizeof(az->ztree)); 305 lock_protect(&az->lock, &az->xtree, sizeof(az->xtree)); 306 /* also lock protects the rbnode's in struct auth_zone, auth_xfer */ 307 lock_rw_init(&az->rpz_lock); 308 lock_protect(&az->rpz_lock, &az->rpz_first, sizeof(az->rpz_first)); 309 return az; 310 } 311 312 int auth_zone_cmp(const void* z1, const void* z2) 313 { 314 /* first sort on class, so that hierarchy can be maintained within 315 * a class */ 316 struct auth_zone* a = (struct auth_zone*)z1; 317 struct auth_zone* b = (struct auth_zone*)z2; 318 int m; 319 if(a->dclass != b->dclass) { 320 if(a->dclass < b->dclass) 321 return -1; 322 return 1; 323 } 324 /* sorted such that higher zones sort before lower zones (their 325 * contents) */ 326 return dname_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m); 327 } 328 329 int auth_data_cmp(const void* z1, const void* z2) 330 { 331 struct auth_data* a = (struct auth_data*)z1; 332 struct auth_data* b = (struct auth_data*)z2; 333 int m; 334 /* canonical sort, because DNSSEC needs that */ 335 return dname_canon_lab_cmp(a->name, a->namelabs, b->name, 336 b->namelabs, &m); 337 } 338 339 int auth_xfer_cmp(const void* z1, const void* z2) 340 { 341 /* first sort on class, so that hierarchy can be maintained within 342 * a class */ 343 struct auth_xfer* a = (struct auth_xfer*)z1; 344 struct auth_xfer* b = (struct auth_xfer*)z2; 345 int m; 346 if(a->dclass != b->dclass) { 347 if(a->dclass < b->dclass) 348 return -1; 349 return 1; 350 } 351 /* sorted such that higher zones sort before lower zones (their 352 * contents) */ 353 return dname_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m); 354 } 355 356 /** delete auth rrset node */ 357 static void 358 auth_rrset_delete(struct auth_rrset* rrset) 359 { 360 if(!rrset) return; 361 free(rrset->data); 362 free(rrset); 363 } 364 365 /** delete auth data domain node */ 366 static void 367 auth_data_delete(struct auth_data* n) 368 { 369 struct auth_rrset* p, *np; 370 if(!n) return; 371 p = n->rrsets; 372 while(p) { 373 np = p->next; 374 auth_rrset_delete(p); 375 p = np; 376 } 377 free(n->name); 378 free(n); 379 } 380 381 /** helper traverse to delete zones */ 382 static void 383 auth_data_del(rbnode_type* n, void* ATTR_UNUSED(arg)) 384 { 385 struct auth_data* z = (struct auth_data*)n->key; 386 auth_data_delete(z); 387 } 388 389 /** delete an auth zone structure (tree remove must be done elsewhere) */ 390 static void 391 auth_zone_delete(struct auth_zone* z, struct auth_zones* az) 392 { 393 if(!z) return; 394 lock_rw_destroy(&z->lock); 395 traverse_postorder(&z->data, auth_data_del, NULL); 396 397 if(az && z->rpz) { 398 /* keep RPZ linked list intact */ 399 lock_rw_wrlock(&az->rpz_lock); 400 if(z->rpz_az_prev) 401 z->rpz_az_prev->rpz_az_next = z->rpz_az_next; 402 else 403 az->rpz_first = z->rpz_az_next; 404 if(z->rpz_az_next) 405 z->rpz_az_next->rpz_az_prev = z->rpz_az_prev; 406 lock_rw_unlock(&az->rpz_lock); 407 } 408 if(z->rpz) 409 rpz_delete(z->rpz); 410 free(z->name); 411 free(z->zonefile); 412 free(z); 413 } 414 415 struct auth_zone* 416 auth_zone_create(struct auth_zones* az, uint8_t* nm, size_t nmlen, 417 uint16_t dclass) 418 { 419 struct auth_zone* z = (struct auth_zone*)calloc(1, sizeof(*z)); 420 if(!z) { 421 return NULL; 422 } 423 z->node.key = z; 424 z->dclass = dclass; 425 z->namelen = nmlen; 426 z->namelabs = dname_count_labels(nm); 427 z->name = memdup(nm, nmlen); 428 if(!z->name) { 429 free(z); 430 return NULL; 431 } 432 rbtree_init(&z->data, &auth_data_cmp); 433 lock_rw_init(&z->lock); 434 lock_protect(&z->lock, &z->name, sizeof(*z)-sizeof(rbnode_type)- 435 sizeof(&z->rpz_az_next)-sizeof(&z->rpz_az_prev)); 436 lock_rw_wrlock(&z->lock); 437 /* z lock protects all, except rbtree itself and the rpz linked list 438 * pointers, which are protected using az->lock */ 439 if(!rbtree_insert(&az->ztree, &z->node)) { 440 lock_rw_unlock(&z->lock); 441 auth_zone_delete(z, NULL); 442 log_warn("duplicate auth zone"); 443 return NULL; 444 } 445 return z; 446 } 447 448 struct auth_zone* 449 auth_zone_find(struct auth_zones* az, uint8_t* nm, size_t nmlen, 450 uint16_t dclass) 451 { 452 struct auth_zone key; 453 key.node.key = &key; 454 key.dclass = dclass; 455 key.name = nm; 456 key.namelen = nmlen; 457 key.namelabs = dname_count_labels(nm); 458 return (struct auth_zone*)rbtree_search(&az->ztree, &key); 459 } 460 461 struct auth_xfer* 462 auth_xfer_find(struct auth_zones* az, uint8_t* nm, size_t nmlen, 463 uint16_t dclass) 464 { 465 struct auth_xfer key; 466 key.node.key = &key; 467 key.dclass = dclass; 468 key.name = nm; 469 key.namelen = nmlen; 470 key.namelabs = dname_count_labels(nm); 471 return (struct auth_xfer*)rbtree_search(&az->xtree, &key); 472 } 473 474 /** find an auth zone or sorted less-or-equal, return true if exact */ 475 static int 476 auth_zone_find_less_equal(struct auth_zones* az, uint8_t* nm, size_t nmlen, 477 uint16_t dclass, struct auth_zone** z) 478 { 479 struct auth_zone key; 480 key.node.key = &key; 481 key.dclass = dclass; 482 key.name = nm; 483 key.namelen = nmlen; 484 key.namelabs = dname_count_labels(nm); 485 return rbtree_find_less_equal(&az->ztree, &key, (rbnode_type**)z); 486 } 487 488 489 /** find the auth zone that is above the given name */ 490 struct auth_zone* 491 auth_zones_find_zone(struct auth_zones* az, uint8_t* name, size_t name_len, 492 uint16_t dclass) 493 { 494 uint8_t* nm = name; 495 size_t nmlen = name_len; 496 struct auth_zone* z; 497 if(auth_zone_find_less_equal(az, nm, nmlen, dclass, &z)) { 498 /* exact match */ 499 return z; 500 } else { 501 /* less-or-nothing */ 502 if(!z) return NULL; /* nothing smaller, nothing above it */ 503 /* we found smaller name; smaller may be above the name, 504 * but not below it. */ 505 nm = dname_get_shared_topdomain(z->name, name); 506 dname_count_size_labels(nm, &nmlen); 507 z = NULL; 508 } 509 510 /* search up */ 511 while(!z) { 512 z = auth_zone_find(az, nm, nmlen, dclass); 513 if(z) return z; 514 if(dname_is_root(nm)) break; 515 dname_remove_label(&nm, &nmlen); 516 } 517 return NULL; 518 } 519 520 /** find or create zone with name str. caller must have lock on az. 521 * returns a wrlocked zone */ 522 static struct auth_zone* 523 auth_zones_find_or_add_zone(struct auth_zones* az, char* name) 524 { 525 uint8_t nm[LDNS_MAX_DOMAINLEN+1]; 526 size_t nmlen = sizeof(nm); 527 struct auth_zone* z; 528 529 if(sldns_str2wire_dname_buf(name, nm, &nmlen) != 0) { 530 log_err("cannot parse auth zone name: %s", name); 531 return 0; 532 } 533 z = auth_zone_find(az, nm, nmlen, LDNS_RR_CLASS_IN); 534 if(!z) { 535 /* not found, create the zone */ 536 z = auth_zone_create(az, nm, nmlen, LDNS_RR_CLASS_IN); 537 } else { 538 lock_rw_wrlock(&z->lock); 539 } 540 return z; 541 } 542 543 /** find or create xfer zone with name str. caller must have lock on az. 544 * returns a locked xfer */ 545 static struct auth_xfer* 546 auth_zones_find_or_add_xfer(struct auth_zones* az, struct auth_zone* z) 547 { 548 struct auth_xfer* x; 549 x = auth_xfer_find(az, z->name, z->namelen, z->dclass); 550 if(!x) { 551 /* not found, create the zone */ 552 x = auth_xfer_create(az, z); 553 } else { 554 lock_basic_lock(&x->lock); 555 } 556 return x; 557 } 558 559 int 560 auth_zone_set_zonefile(struct auth_zone* z, char* zonefile) 561 { 562 if(z->zonefile) free(z->zonefile); 563 if(zonefile == NULL) { 564 z->zonefile = NULL; 565 } else { 566 z->zonefile = strdup(zonefile); 567 if(!z->zonefile) { 568 log_err("malloc failure"); 569 return 0; 570 } 571 } 572 return 1; 573 } 574 575 /** set auth zone fallback. caller must have lock on zone */ 576 int 577 auth_zone_set_fallback(struct auth_zone* z, char* fallbackstr) 578 { 579 if(strcmp(fallbackstr, "yes") != 0 && strcmp(fallbackstr, "no") != 0){ 580 log_err("auth zone fallback, expected yes or no, got %s", 581 fallbackstr); 582 return 0; 583 } 584 z->fallback_enabled = (strcmp(fallbackstr, "yes")==0); 585 return 1; 586 } 587 588 /** create domain with the given name */ 589 static struct auth_data* 590 az_domain_create(struct auth_zone* z, uint8_t* nm, size_t nmlen) 591 { 592 struct auth_data* n = (struct auth_data*)malloc(sizeof(*n)); 593 if(!n) return NULL; 594 memset(n, 0, sizeof(*n)); 595 n->node.key = n; 596 n->name = memdup(nm, nmlen); 597 if(!n->name) { 598 free(n); 599 return NULL; 600 } 601 n->namelen = nmlen; 602 n->namelabs = dname_count_labels(nm); 603 if(!rbtree_insert(&z->data, &n->node)) { 604 log_warn("duplicate auth domain name"); 605 free(n->name); 606 free(n); 607 return NULL; 608 } 609 return n; 610 } 611 612 /** find domain with exactly the given name */ 613 static struct auth_data* 614 az_find_name(struct auth_zone* z, uint8_t* nm, size_t nmlen) 615 { 616 struct auth_zone key; 617 key.node.key = &key; 618 key.name = nm; 619 key.namelen = nmlen; 620 key.namelabs = dname_count_labels(nm); 621 return (struct auth_data*)rbtree_search(&z->data, &key); 622 } 623 624 /** Find domain name (or closest match) */ 625 static void 626 az_find_domain(struct auth_zone* z, struct query_info* qinfo, int* node_exact, 627 struct auth_data** node) 628 { 629 struct auth_zone key; 630 key.node.key = &key; 631 key.name = qinfo->qname; 632 key.namelen = qinfo->qname_len; 633 key.namelabs = dname_count_labels(key.name); 634 *node_exact = rbtree_find_less_equal(&z->data, &key, 635 (rbnode_type**)node); 636 } 637 638 /** find or create domain with name in zone */ 639 static struct auth_data* 640 az_domain_find_or_create(struct auth_zone* z, uint8_t* dname, 641 size_t dname_len) 642 { 643 struct auth_data* n = az_find_name(z, dname, dname_len); 644 if(!n) { 645 n = az_domain_create(z, dname, dname_len); 646 } 647 return n; 648 } 649 650 /** find rrset of given type in the domain */ 651 static struct auth_rrset* 652 az_domain_rrset(struct auth_data* n, uint16_t t) 653 { 654 struct auth_rrset* rrset; 655 if(!n) return NULL; 656 rrset = n->rrsets; 657 while(rrset) { 658 if(rrset->type == t) 659 return rrset; 660 rrset = rrset->next; 661 } 662 return NULL; 663 } 664 665 /** remove rrset of this type from domain */ 666 static void 667 domain_remove_rrset(struct auth_data* node, uint16_t rr_type) 668 { 669 struct auth_rrset* rrset, *prev; 670 if(!node) return; 671 prev = NULL; 672 rrset = node->rrsets; 673 while(rrset) { 674 if(rrset->type == rr_type) { 675 /* found it, now delete it */ 676 if(prev) prev->next = rrset->next; 677 else node->rrsets = rrset->next; 678 auth_rrset_delete(rrset); 679 return; 680 } 681 prev = rrset; 682 rrset = rrset->next; 683 } 684 } 685 686 /** find an rrsig index in the rrset. returns true if found */ 687 static int 688 az_rrset_find_rrsig(struct packed_rrset_data* d, uint8_t* rdata, size_t len, 689 size_t* index) 690 { 691 size_t i; 692 for(i=d->count; i<d->count + d->rrsig_count; i++) { 693 if(d->rr_len[i] != len) 694 continue; 695 if(memcmp(d->rr_data[i], rdata, len) == 0) { 696 *index = i; 697 return 1; 698 } 699 } 700 return 0; 701 } 702 703 /** see if rdata is duplicate */ 704 static int 705 rdata_duplicate(struct packed_rrset_data* d, uint8_t* rdata, size_t len) 706 { 707 size_t i; 708 for(i=0; i<d->count + d->rrsig_count; i++) { 709 if(d->rr_len[i] != len) 710 continue; 711 if(memcmp(d->rr_data[i], rdata, len) == 0) 712 return 1; 713 } 714 return 0; 715 } 716 717 /** get rrsig type covered from rdata. 718 * @param rdata: rdata in wireformat, starting with 16bit rdlength. 719 * @param rdatalen: length of rdata buffer. 720 * @return type covered (or 0). 721 */ 722 static uint16_t 723 rrsig_rdata_get_type_covered(uint8_t* rdata, size_t rdatalen) 724 { 725 if(rdatalen < 4) 726 return 0; 727 return sldns_read_uint16(rdata+2); 728 } 729 730 /** remove RR from existing RRset. Also sig, if it is a signature. 731 * reallocates the packed rrset for a new one, false on alloc failure */ 732 static int 733 rrset_remove_rr(struct auth_rrset* rrset, size_t index) 734 { 735 struct packed_rrset_data* d, *old = rrset->data; 736 size_t i; 737 if(index >= old->count + old->rrsig_count) 738 return 0; /* index out of bounds */ 739 d = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(old) - ( 740 sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t) + 741 old->rr_len[index])); 742 if(!d) { 743 log_err("malloc failure"); 744 return 0; 745 } 746 d->ttl = old->ttl; 747 d->count = old->count; 748 d->rrsig_count = old->rrsig_count; 749 if(index < d->count) d->count--; 750 else d->rrsig_count--; 751 d->trust = old->trust; 752 d->security = old->security; 753 754 /* set rr_len, needed for ptr_fixup */ 755 d->rr_len = (size_t*)((uint8_t*)d + 756 sizeof(struct packed_rrset_data)); 757 if(index > 0) 758 memmove(d->rr_len, old->rr_len, (index)*sizeof(size_t)); 759 if(index+1 < old->count+old->rrsig_count) 760 memmove(&d->rr_len[index], &old->rr_len[index+1], 761 (old->count+old->rrsig_count - (index+1))*sizeof(size_t)); 762 packed_rrset_ptr_fixup(d); 763 764 /* move over ttls */ 765 if(index > 0) 766 memmove(d->rr_ttl, old->rr_ttl, (index)*sizeof(time_t)); 767 if(index+1 < old->count+old->rrsig_count) 768 memmove(&d->rr_ttl[index], &old->rr_ttl[index+1], 769 (old->count+old->rrsig_count - (index+1))*sizeof(time_t)); 770 771 /* move over rr_data */ 772 for(i=0; i<d->count+d->rrsig_count; i++) { 773 size_t oldi; 774 if(i < index) oldi = i; 775 else oldi = i+1; 776 memmove(d->rr_data[i], old->rr_data[oldi], d->rr_len[i]); 777 } 778 779 /* recalc ttl (lowest of remaining RR ttls) */ 780 if(d->count + d->rrsig_count > 0) 781 d->ttl = d->rr_ttl[0]; 782 for(i=0; i<d->count+d->rrsig_count; i++) { 783 if(d->rr_ttl[i] < d->ttl) 784 d->ttl = d->rr_ttl[i]; 785 } 786 787 free(rrset->data); 788 rrset->data = d; 789 return 1; 790 } 791 792 /** add RR to existing RRset. If insert_sig is true, add to rrsigs. 793 * This reallocates the packed rrset for a new one */ 794 static int 795 rrset_add_rr(struct auth_rrset* rrset, uint32_t rr_ttl, uint8_t* rdata, 796 size_t rdatalen, int insert_sig) 797 { 798 struct packed_rrset_data* d, *old = rrset->data; 799 size_t total, old_total; 800 801 d = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(old) 802 + sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t) 803 + rdatalen); 804 if(!d) { 805 log_err("out of memory"); 806 return 0; 807 } 808 /* copy base values */ 809 memcpy(d, old, sizeof(struct packed_rrset_data)); 810 if(!insert_sig) { 811 d->count++; 812 } else { 813 d->rrsig_count++; 814 } 815 old_total = old->count + old->rrsig_count; 816 total = d->count + d->rrsig_count; 817 /* set rr_len, needed for ptr_fixup */ 818 d->rr_len = (size_t*)((uint8_t*)d + 819 sizeof(struct packed_rrset_data)); 820 if(old->count != 0) 821 memmove(d->rr_len, old->rr_len, old->count*sizeof(size_t)); 822 if(old->rrsig_count != 0) 823 memmove(d->rr_len+d->count, old->rr_len+old->count, 824 old->rrsig_count*sizeof(size_t)); 825 if(!insert_sig) 826 d->rr_len[d->count-1] = rdatalen; 827 else d->rr_len[total-1] = rdatalen; 828 packed_rrset_ptr_fixup(d); 829 if((time_t)rr_ttl < d->ttl) 830 d->ttl = rr_ttl; 831 832 /* copy old values into new array */ 833 if(old->count != 0) { 834 memmove(d->rr_ttl, old->rr_ttl, old->count*sizeof(time_t)); 835 /* all the old rr pieces are allocated sequential, so we 836 * can copy them in one go */ 837 memmove(d->rr_data[0], old->rr_data[0], 838 (old->rr_data[old->count-1] - old->rr_data[0]) + 839 old->rr_len[old->count-1]); 840 } 841 if(old->rrsig_count != 0) { 842 memmove(d->rr_ttl+d->count, old->rr_ttl+old->count, 843 old->rrsig_count*sizeof(time_t)); 844 memmove(d->rr_data[d->count], old->rr_data[old->count], 845 (old->rr_data[old_total-1] - old->rr_data[old->count]) + 846 old->rr_len[old_total-1]); 847 } 848 849 /* insert new value */ 850 if(!insert_sig) { 851 d->rr_ttl[d->count-1] = rr_ttl; 852 memmove(d->rr_data[d->count-1], rdata, rdatalen); 853 } else { 854 d->rr_ttl[total-1] = rr_ttl; 855 memmove(d->rr_data[total-1], rdata, rdatalen); 856 } 857 858 rrset->data = d; 859 free(old); 860 return 1; 861 } 862 863 /** Create new rrset for node with packed rrset with one RR element */ 864 static struct auth_rrset* 865 rrset_create(struct auth_data* node, uint16_t rr_type, uint32_t rr_ttl, 866 uint8_t* rdata, size_t rdatalen) 867 { 868 struct auth_rrset* rrset = (struct auth_rrset*)calloc(1, 869 sizeof(*rrset)); 870 struct auth_rrset* p, *prev; 871 struct packed_rrset_data* d; 872 if(!rrset) { 873 log_err("out of memory"); 874 return NULL; 875 } 876 rrset->type = rr_type; 877 878 /* the rrset data structure, with one RR */ 879 d = (struct packed_rrset_data*)calloc(1, 880 sizeof(struct packed_rrset_data) + sizeof(size_t) + 881 sizeof(uint8_t*) + sizeof(time_t) + rdatalen); 882 if(!d) { 883 free(rrset); 884 log_err("out of memory"); 885 return NULL; 886 } 887 rrset->data = d; 888 d->ttl = rr_ttl; 889 d->trust = rrset_trust_prim_noglue; 890 d->rr_len = (size_t*)((uint8_t*)d + sizeof(struct packed_rrset_data)); 891 d->rr_data = (uint8_t**)&(d->rr_len[1]); 892 d->rr_ttl = (time_t*)&(d->rr_data[1]); 893 d->rr_data[0] = (uint8_t*)&(d->rr_ttl[1]); 894 895 /* insert the RR */ 896 d->rr_len[0] = rdatalen; 897 d->rr_ttl[0] = rr_ttl; 898 memmove(d->rr_data[0], rdata, rdatalen); 899 d->count++; 900 901 /* insert rrset into linked list for domain */ 902 /* find sorted place to link the rrset into the list */ 903 prev = NULL; 904 p = node->rrsets; 905 while(p && p->type<=rr_type) { 906 prev = p; 907 p = p->next; 908 } 909 /* so, prev is smaller, and p is larger than rr_type */ 910 rrset->next = p; 911 if(prev) prev->next = rrset; 912 else node->rrsets = rrset; 913 return rrset; 914 } 915 916 /** count number (and size) of rrsigs that cover a type */ 917 static size_t 918 rrsig_num_that_cover(struct auth_rrset* rrsig, uint16_t rr_type, size_t* sigsz) 919 { 920 struct packed_rrset_data* d = rrsig->data; 921 size_t i, num = 0; 922 *sigsz = 0; 923 log_assert(d && rrsig->type == LDNS_RR_TYPE_RRSIG); 924 for(i=0; i<d->count+d->rrsig_count; i++) { 925 if(rrsig_rdata_get_type_covered(d->rr_data[i], 926 d->rr_len[i]) == rr_type) { 927 num++; 928 (*sigsz) += d->rr_len[i]; 929 } 930 } 931 return num; 932 } 933 934 /** See if rrsig set has covered sigs for rrset and move them over */ 935 static int 936 rrset_moveover_rrsigs(struct auth_data* node, uint16_t rr_type, 937 struct auth_rrset* rrset, struct auth_rrset* rrsig) 938 { 939 size_t sigs, sigsz, i, j, total; 940 struct packed_rrset_data* sigold = rrsig->data; 941 struct packed_rrset_data* old = rrset->data; 942 struct packed_rrset_data* d, *sigd; 943 944 log_assert(rrset->type == rr_type); 945 log_assert(rrsig->type == LDNS_RR_TYPE_RRSIG); 946 sigs = rrsig_num_that_cover(rrsig, rr_type, &sigsz); 947 if(sigs == 0) { 948 /* 0 rrsigs to move over, done */ 949 return 1; 950 } 951 952 /* allocate rrset sigsz larger for extra sigs elements, and 953 * allocate rrsig sigsz smaller for less sigs elements. */ 954 d = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(old) 955 + sigs*(sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t)) 956 + sigsz); 957 if(!d) { 958 log_err("out of memory"); 959 return 0; 960 } 961 /* copy base values */ 962 total = old->count + old->rrsig_count; 963 memcpy(d, old, sizeof(struct packed_rrset_data)); 964 d->rrsig_count += sigs; 965 /* setup rr_len */ 966 d->rr_len = (size_t*)((uint8_t*)d + 967 sizeof(struct packed_rrset_data)); 968 if(total != 0) 969 memmove(d->rr_len, old->rr_len, total*sizeof(size_t)); 970 j = d->count+d->rrsig_count-sigs; 971 for(i=0; i<sigold->count+sigold->rrsig_count; i++) { 972 if(rrsig_rdata_get_type_covered(sigold->rr_data[i], 973 sigold->rr_len[i]) == rr_type) { 974 d->rr_len[j] = sigold->rr_len[i]; 975 j++; 976 } 977 } 978 packed_rrset_ptr_fixup(d); 979 980 /* copy old values into new array */ 981 if(total != 0) { 982 memmove(d->rr_ttl, old->rr_ttl, total*sizeof(time_t)); 983 /* all the old rr pieces are allocated sequential, so we 984 * can copy them in one go */ 985 memmove(d->rr_data[0], old->rr_data[0], 986 (old->rr_data[total-1] - old->rr_data[0]) + 987 old->rr_len[total-1]); 988 } 989 990 /* move over the rrsigs to the larger rrset*/ 991 j = d->count+d->rrsig_count-sigs; 992 for(i=0; i<sigold->count+sigold->rrsig_count; i++) { 993 if(rrsig_rdata_get_type_covered(sigold->rr_data[i], 994 sigold->rr_len[i]) == rr_type) { 995 /* move this one over to location j */ 996 d->rr_ttl[j] = sigold->rr_ttl[i]; 997 memmove(d->rr_data[j], sigold->rr_data[i], 998 sigold->rr_len[i]); 999 if(d->rr_ttl[j] < d->ttl) 1000 d->ttl = d->rr_ttl[j]; 1001 j++; 1002 } 1003 } 1004 1005 /* put it in and deallocate the old rrset */ 1006 rrset->data = d; 1007 free(old); 1008 1009 /* now make rrsig set smaller */ 1010 if(sigold->count+sigold->rrsig_count == sigs) { 1011 /* remove all sigs from rrsig, remove it entirely */ 1012 domain_remove_rrset(node, LDNS_RR_TYPE_RRSIG); 1013 return 1; 1014 } 1015 log_assert(packed_rrset_sizeof(sigold) > sigs*(sizeof(size_t) + 1016 sizeof(uint8_t*) + sizeof(time_t)) + sigsz); 1017 sigd = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(sigold) 1018 - sigs*(sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t)) 1019 - sigsz); 1020 if(!sigd) { 1021 /* no need to free up d, it has already been placed in the 1022 * node->rrset structure */ 1023 log_err("out of memory"); 1024 return 0; 1025 } 1026 /* copy base values */ 1027 memcpy(sigd, sigold, sizeof(struct packed_rrset_data)); 1028 /* in sigd the RRSIGs are stored in the base of the RR, in count */ 1029 sigd->count -= sigs; 1030 /* setup rr_len */ 1031 sigd->rr_len = (size_t*)((uint8_t*)sigd + 1032 sizeof(struct packed_rrset_data)); 1033 j = 0; 1034 for(i=0; i<sigold->count+sigold->rrsig_count; i++) { 1035 if(rrsig_rdata_get_type_covered(sigold->rr_data[i], 1036 sigold->rr_len[i]) != rr_type) { 1037 sigd->rr_len[j] = sigold->rr_len[i]; 1038 j++; 1039 } 1040 } 1041 packed_rrset_ptr_fixup(sigd); 1042 1043 /* copy old values into new rrsig array */ 1044 j = 0; 1045 for(i=0; i<sigold->count+sigold->rrsig_count; i++) { 1046 if(rrsig_rdata_get_type_covered(sigold->rr_data[i], 1047 sigold->rr_len[i]) != rr_type) { 1048 /* move this one over to location j */ 1049 sigd->rr_ttl[j] = sigold->rr_ttl[i]; 1050 memmove(sigd->rr_data[j], sigold->rr_data[i], 1051 sigold->rr_len[i]); 1052 if(j==0) sigd->ttl = sigd->rr_ttl[j]; 1053 else { 1054 if(sigd->rr_ttl[j] < sigd->ttl) 1055 sigd->ttl = sigd->rr_ttl[j]; 1056 } 1057 j++; 1058 } 1059 } 1060 1061 /* put it in and deallocate the old rrset */ 1062 rrsig->data = sigd; 1063 free(sigold); 1064 1065 return 1; 1066 } 1067 1068 /** copy the rrsigs from the rrset to the rrsig rrset, because the rrset 1069 * is going to be deleted. reallocates the RRSIG rrset data. */ 1070 static int 1071 rrsigs_copy_from_rrset_to_rrsigset(struct auth_rrset* rrset, 1072 struct auth_rrset* rrsigset) 1073 { 1074 size_t i; 1075 if(rrset->data->rrsig_count == 0) 1076 return 1; 1077 1078 /* move them over one by one, because there might be duplicates, 1079 * duplicates are ignored */ 1080 for(i=rrset->data->count; 1081 i<rrset->data->count+rrset->data->rrsig_count; i++) { 1082 uint8_t* rdata = rrset->data->rr_data[i]; 1083 size_t rdatalen = rrset->data->rr_len[i]; 1084 time_t rr_ttl = rrset->data->rr_ttl[i]; 1085 1086 if(rdata_duplicate(rrsigset->data, rdata, rdatalen)) { 1087 continue; 1088 } 1089 if(!rrset_add_rr(rrsigset, rr_ttl, rdata, rdatalen, 0)) 1090 return 0; 1091 } 1092 return 1; 1093 } 1094 1095 /** Add rr to node, ignores duplicate RRs, 1096 * rdata points to buffer with rdatalen octets, starts with 2bytelength. */ 1097 static int 1098 az_domain_add_rr(struct auth_data* node, uint16_t rr_type, uint32_t rr_ttl, 1099 uint8_t* rdata, size_t rdatalen, int* duplicate) 1100 { 1101 struct auth_rrset* rrset; 1102 /* packed rrsets have their rrsigs along with them, sort them out */ 1103 if(rr_type == LDNS_RR_TYPE_RRSIG) { 1104 uint16_t ctype = rrsig_rdata_get_type_covered(rdata, rdatalen); 1105 if((rrset=az_domain_rrset(node, ctype))!= NULL) { 1106 /* a node of the correct type exists, add the RRSIG 1107 * to the rrset of the covered data type */ 1108 if(rdata_duplicate(rrset->data, rdata, rdatalen)) { 1109 if(duplicate) *duplicate = 1; 1110 return 1; 1111 } 1112 if(!rrset_add_rr(rrset, rr_ttl, rdata, rdatalen, 1)) 1113 return 0; 1114 } else if((rrset=az_domain_rrset(node, rr_type))!= NULL) { 1115 /* add RRSIG to rrset of type RRSIG */ 1116 if(rdata_duplicate(rrset->data, rdata, rdatalen)) { 1117 if(duplicate) *duplicate = 1; 1118 return 1; 1119 } 1120 if(!rrset_add_rr(rrset, rr_ttl, rdata, rdatalen, 0)) 1121 return 0; 1122 } else { 1123 /* create rrset of type RRSIG */ 1124 if(!rrset_create(node, rr_type, rr_ttl, rdata, 1125 rdatalen)) 1126 return 0; 1127 } 1128 } else { 1129 /* normal RR type */ 1130 if((rrset=az_domain_rrset(node, rr_type))!= NULL) { 1131 /* add data to existing node with data type */ 1132 if(rdata_duplicate(rrset->data, rdata, rdatalen)) { 1133 if(duplicate) *duplicate = 1; 1134 return 1; 1135 } 1136 if(!rrset_add_rr(rrset, rr_ttl, rdata, rdatalen, 0)) 1137 return 0; 1138 } else { 1139 struct auth_rrset* rrsig; 1140 /* create new node with data type */ 1141 if(!(rrset=rrset_create(node, rr_type, rr_ttl, rdata, 1142 rdatalen))) 1143 return 0; 1144 1145 /* see if node of type RRSIG has signatures that 1146 * cover the data type, and move them over */ 1147 /* and then make the RRSIG type smaller */ 1148 if((rrsig=az_domain_rrset(node, LDNS_RR_TYPE_RRSIG)) 1149 != NULL) { 1150 if(!rrset_moveover_rrsigs(node, rr_type, 1151 rrset, rrsig)) 1152 return 0; 1153 } 1154 } 1155 } 1156 return 1; 1157 } 1158 1159 /** insert RR into zone, ignore duplicates */ 1160 static int 1161 az_insert_rr(struct auth_zone* z, uint8_t* rr, size_t rr_len, 1162 size_t dname_len, int* duplicate) 1163 { 1164 struct auth_data* node; 1165 uint8_t* dname = rr; 1166 uint16_t rr_type = sldns_wirerr_get_type(rr, rr_len, dname_len); 1167 uint16_t rr_class = sldns_wirerr_get_class(rr, rr_len, dname_len); 1168 uint32_t rr_ttl = sldns_wirerr_get_ttl(rr, rr_len, dname_len); 1169 size_t rdatalen = ((size_t)sldns_wirerr_get_rdatalen(rr, rr_len, 1170 dname_len))+2; 1171 /* rdata points to rdata prefixed with uint16 rdatalength */ 1172 uint8_t* rdata = sldns_wirerr_get_rdatawl(rr, rr_len, dname_len); 1173 1174 if(rr_class != z->dclass) { 1175 log_err("wrong class for RR"); 1176 return 0; 1177 } 1178 if(!(node=az_domain_find_or_create(z, dname, dname_len))) { 1179 log_err("cannot create domain"); 1180 return 0; 1181 } 1182 if(!az_domain_add_rr(node, rr_type, rr_ttl, rdata, rdatalen, 1183 duplicate)) { 1184 log_err("cannot add RR to domain"); 1185 return 0; 1186 } 1187 if(z->rpz) { 1188 if(!(rpz_insert_rr(z->rpz, z->name, z->namelen, dname, 1189 dname_len, rr_type, rr_class, rr_ttl, rdata, rdatalen, 1190 rr, rr_len))) 1191 return 0; 1192 } 1193 return 1; 1194 } 1195 1196 /** Remove rr from node, ignores nonexisting RRs, 1197 * rdata points to buffer with rdatalen octets, starts with 2bytelength. */ 1198 static int 1199 az_domain_remove_rr(struct auth_data* node, uint16_t rr_type, 1200 uint8_t* rdata, size_t rdatalen, int* nonexist) 1201 { 1202 struct auth_rrset* rrset; 1203 size_t index = 0; 1204 1205 /* find the plain RR of the given type */ 1206 if((rrset=az_domain_rrset(node, rr_type))!= NULL) { 1207 if(packed_rrset_find_rr(rrset->data, rdata, rdatalen, &index)) { 1208 if(rrset->data->count == 1 && 1209 rrset->data->rrsig_count == 0) { 1210 /* last RR, delete the rrset */ 1211 domain_remove_rrset(node, rr_type); 1212 } else if(rrset->data->count == 1 && 1213 rrset->data->rrsig_count != 0) { 1214 /* move RRSIGs to the RRSIG rrset, or 1215 * this one becomes that RRset */ 1216 struct auth_rrset* rrsigset = az_domain_rrset( 1217 node, LDNS_RR_TYPE_RRSIG); 1218 if(rrsigset) { 1219 /* move left over rrsigs to the 1220 * existing rrset of type RRSIG */ 1221 rrsigs_copy_from_rrset_to_rrsigset( 1222 rrset, rrsigset); 1223 /* and then delete the rrset */ 1224 domain_remove_rrset(node, rr_type); 1225 } else { 1226 /* no rrset of type RRSIG, this 1227 * set is now of that type, 1228 * just remove the rr */ 1229 if(!rrset_remove_rr(rrset, index)) 1230 return 0; 1231 rrset->type = LDNS_RR_TYPE_RRSIG; 1232 rrset->data->count = rrset->data->rrsig_count; 1233 rrset->data->rrsig_count = 0; 1234 } 1235 } else { 1236 /* remove the RR from the rrset */ 1237 if(!rrset_remove_rr(rrset, index)) 1238 return 0; 1239 } 1240 return 1; 1241 } 1242 /* rr not found in rrset */ 1243 } 1244 1245 /* is it a type RRSIG, look under the covered type */ 1246 if(rr_type == LDNS_RR_TYPE_RRSIG) { 1247 uint16_t ctype = rrsig_rdata_get_type_covered(rdata, rdatalen); 1248 if((rrset=az_domain_rrset(node, ctype))!= NULL) { 1249 if(az_rrset_find_rrsig(rrset->data, rdata, rdatalen, 1250 &index)) { 1251 /* rrsig should have d->count > 0, be 1252 * over some rr of that type */ 1253 /* remove the rrsig from the rrsigs list of the 1254 * rrset */ 1255 if(!rrset_remove_rr(rrset, index)) 1256 return 0; 1257 return 1; 1258 } 1259 } 1260 /* also RRSIG not found */ 1261 } 1262 1263 /* nothing found to delete */ 1264 if(nonexist) *nonexist = 1; 1265 return 1; 1266 } 1267 1268 /** remove RR from zone, ignore if it does not exist, false on alloc failure*/ 1269 static int 1270 az_remove_rr(struct auth_zone* z, uint8_t* rr, size_t rr_len, 1271 size_t dname_len, int* nonexist) 1272 { 1273 struct auth_data* node; 1274 uint8_t* dname = rr; 1275 uint16_t rr_type = sldns_wirerr_get_type(rr, rr_len, dname_len); 1276 uint16_t rr_class = sldns_wirerr_get_class(rr, rr_len, dname_len); 1277 size_t rdatalen = ((size_t)sldns_wirerr_get_rdatalen(rr, rr_len, 1278 dname_len))+2; 1279 /* rdata points to rdata prefixed with uint16 rdatalength */ 1280 uint8_t* rdata = sldns_wirerr_get_rdatawl(rr, rr_len, dname_len); 1281 1282 if(rr_class != z->dclass) { 1283 log_err("wrong class for RR"); 1284 /* really also a nonexisting entry, because no records 1285 * of that class in the zone, but return an error because 1286 * getting records of the wrong class is a failure of the 1287 * zone transfer */ 1288 return 0; 1289 } 1290 node = az_find_name(z, dname, dname_len); 1291 if(!node) { 1292 /* node with that name does not exist */ 1293 /* nonexisting entry, because no such name */ 1294 *nonexist = 1; 1295 return 1; 1296 } 1297 if(!az_domain_remove_rr(node, rr_type, rdata, rdatalen, nonexist)) { 1298 /* alloc failure or so */ 1299 return 0; 1300 } 1301 /* remove the node, if necessary */ 1302 /* an rrsets==NULL entry is not kept around for empty nonterminals, 1303 * and also parent nodes are not kept around, so we just delete it */ 1304 if(node->rrsets == NULL) { 1305 (void)rbtree_delete(&z->data, node); 1306 auth_data_delete(node); 1307 } 1308 if(z->rpz) { 1309 rpz_remove_rr(z->rpz, z->name, z->namelen, dname, dname_len, 1310 rr_type, rr_class, rdata, rdatalen); 1311 } 1312 return 1; 1313 } 1314 1315 /** decompress an RR into the buffer where it'll be an uncompressed RR 1316 * with uncompressed dname and uncompressed rdata (dnames) */ 1317 static int 1318 decompress_rr_into_buffer(struct sldns_buffer* buf, uint8_t* pkt, 1319 size_t pktlen, uint8_t* dname, uint16_t rr_type, uint16_t rr_class, 1320 uint32_t rr_ttl, uint8_t* rr_data, uint16_t rr_rdlen) 1321 { 1322 sldns_buffer pktbuf; 1323 size_t dname_len = 0; 1324 size_t rdlenpos; 1325 size_t rdlen; 1326 uint8_t* rd; 1327 const sldns_rr_descriptor* desc; 1328 sldns_buffer_init_frm_data(&pktbuf, pkt, pktlen); 1329 sldns_buffer_clear(buf); 1330 1331 /* decompress dname */ 1332 sldns_buffer_set_position(&pktbuf, 1333 (size_t)(dname - sldns_buffer_current(&pktbuf))); 1334 dname_len = pkt_dname_len(&pktbuf); 1335 if(dname_len == 0) return 0; /* parse fail on dname */ 1336 if(!sldns_buffer_available(buf, dname_len)) return 0; 1337 dname_pkt_copy(&pktbuf, sldns_buffer_current(buf), dname); 1338 sldns_buffer_skip(buf, (ssize_t)dname_len); 1339 1340 /* type, class, ttl and rdatalength fields */ 1341 if(!sldns_buffer_available(buf, 10)) return 0; 1342 sldns_buffer_write_u16(buf, rr_type); 1343 sldns_buffer_write_u16(buf, rr_class); 1344 sldns_buffer_write_u32(buf, rr_ttl); 1345 rdlenpos = sldns_buffer_position(buf); 1346 sldns_buffer_write_u16(buf, 0); /* rd length position */ 1347 1348 /* decompress rdata */ 1349 desc = sldns_rr_descript(rr_type); 1350 rd = rr_data; 1351 rdlen = rr_rdlen; 1352 if(rdlen > 0 && desc && desc->_dname_count > 0) { 1353 int count = (int)desc->_dname_count; 1354 int rdf = 0; 1355 size_t len; /* how much rdata to plain copy */ 1356 size_t uncompressed_len, compressed_len; 1357 size_t oldpos; 1358 /* decompress dnames. */ 1359 while(rdlen > 0 && count) { 1360 switch(desc->_wireformat[rdf]) { 1361 case LDNS_RDF_TYPE_DNAME: 1362 sldns_buffer_set_position(&pktbuf, 1363 (size_t)(rd - 1364 sldns_buffer_begin(&pktbuf))); 1365 oldpos = sldns_buffer_position(&pktbuf); 1366 /* moves pktbuf to right after the 1367 * compressed dname, and returns uncompressed 1368 * dname length */ 1369 uncompressed_len = pkt_dname_len(&pktbuf); 1370 if(!uncompressed_len) 1371 return 0; /* parse error in dname */ 1372 if(!sldns_buffer_available(buf, 1373 uncompressed_len)) 1374 /* dname too long for buffer */ 1375 return 0; 1376 dname_pkt_copy(&pktbuf, 1377 sldns_buffer_current(buf), rd); 1378 sldns_buffer_skip(buf, (ssize_t)uncompressed_len); 1379 compressed_len = sldns_buffer_position( 1380 &pktbuf) - oldpos; 1381 rd += compressed_len; 1382 rdlen -= compressed_len; 1383 count--; 1384 len = 0; 1385 break; 1386 case LDNS_RDF_TYPE_STR: 1387 len = rd[0] + 1; 1388 break; 1389 default: 1390 len = get_rdf_size(desc->_wireformat[rdf]); 1391 break; 1392 } 1393 if(len) { 1394 if(!sldns_buffer_available(buf, len)) 1395 return 0; /* too long for buffer */ 1396 sldns_buffer_write(buf, rd, len); 1397 rd += len; 1398 rdlen -= len; 1399 } 1400 rdf++; 1401 } 1402 } 1403 /* copy remaining data */ 1404 if(rdlen > 0) { 1405 if(!sldns_buffer_available(buf, rdlen)) return 0; 1406 sldns_buffer_write(buf, rd, rdlen); 1407 } 1408 /* fixup rdlength */ 1409 sldns_buffer_write_u16_at(buf, rdlenpos, 1410 sldns_buffer_position(buf)-rdlenpos-2); 1411 sldns_buffer_flip(buf); 1412 return 1; 1413 } 1414 1415 /** insert RR into zone, from packet, decompress RR, 1416 * if duplicate is nonNULL set the flag but otherwise ignore duplicates */ 1417 static int 1418 az_insert_rr_decompress(struct auth_zone* z, uint8_t* pkt, size_t pktlen, 1419 struct sldns_buffer* scratch_buffer, uint8_t* dname, uint16_t rr_type, 1420 uint16_t rr_class, uint32_t rr_ttl, uint8_t* rr_data, 1421 uint16_t rr_rdlen, int* duplicate) 1422 { 1423 uint8_t* rr; 1424 size_t rr_len; 1425 size_t dname_len; 1426 if(!decompress_rr_into_buffer(scratch_buffer, pkt, pktlen, dname, 1427 rr_type, rr_class, rr_ttl, rr_data, rr_rdlen)) { 1428 log_err("could not decompress RR"); 1429 return 0; 1430 } 1431 rr = sldns_buffer_begin(scratch_buffer); 1432 rr_len = sldns_buffer_limit(scratch_buffer); 1433 dname_len = dname_valid(rr, rr_len); 1434 return az_insert_rr(z, rr, rr_len, dname_len, duplicate); 1435 } 1436 1437 /** remove RR from zone, from packet, decompress RR, 1438 * if nonexist is nonNULL set the flag but otherwise ignore nonexisting entries*/ 1439 static int 1440 az_remove_rr_decompress(struct auth_zone* z, uint8_t* pkt, size_t pktlen, 1441 struct sldns_buffer* scratch_buffer, uint8_t* dname, uint16_t rr_type, 1442 uint16_t rr_class, uint32_t rr_ttl, uint8_t* rr_data, 1443 uint16_t rr_rdlen, int* nonexist) 1444 { 1445 uint8_t* rr; 1446 size_t rr_len; 1447 size_t dname_len; 1448 if(!decompress_rr_into_buffer(scratch_buffer, pkt, pktlen, dname, 1449 rr_type, rr_class, rr_ttl, rr_data, rr_rdlen)) { 1450 log_err("could not decompress RR"); 1451 return 0; 1452 } 1453 rr = sldns_buffer_begin(scratch_buffer); 1454 rr_len = sldns_buffer_limit(scratch_buffer); 1455 dname_len = dname_valid(rr, rr_len); 1456 return az_remove_rr(z, rr, rr_len, dname_len, nonexist); 1457 } 1458 1459 /** 1460 * Parse zonefile 1461 * @param z: zone to read in. 1462 * @param in: file to read from (just opened). 1463 * @param rr: buffer to use for RRs, 64k. 1464 * passed so that recursive includes can use the same buffer and do 1465 * not grow the stack too much. 1466 * @param rrbuflen: sizeof rr buffer. 1467 * @param state: parse state with $ORIGIN, $TTL and 'prev-dname' and so on, 1468 * that is kept between includes. 1469 * The lineno is set at 1 and then increased by the function. 1470 * @param fname: file name. 1471 * @param depth: recursion depth for includes 1472 * @param cfg: config for chroot. 1473 * returns false on failure, has printed an error message 1474 */ 1475 static int 1476 az_parse_file(struct auth_zone* z, FILE* in, uint8_t* rr, size_t rrbuflen, 1477 struct sldns_file_parse_state* state, char* fname, int depth, 1478 struct config_file* cfg) 1479 { 1480 size_t rr_len, dname_len; 1481 int status; 1482 state->lineno = 1; 1483 1484 while(!feof(in)) { 1485 rr_len = rrbuflen; 1486 dname_len = 0; 1487 status = sldns_fp2wire_rr_buf(in, rr, &rr_len, &dname_len, 1488 state); 1489 if(status == LDNS_WIREPARSE_ERR_INCLUDE && rr_len == 0) { 1490 /* we have $INCLUDE or $something */ 1491 if(strncmp((char*)rr, "$INCLUDE ", 9) == 0 || 1492 strncmp((char*)rr, "$INCLUDE\t", 9) == 0) { 1493 FILE* inc; 1494 int lineno_orig = state->lineno; 1495 char* incfile = (char*)rr + 8; 1496 if(depth > MAX_INCLUDE_DEPTH) { 1497 log_err("%s:%d max include depth" 1498 "exceeded", fname, state->lineno); 1499 return 0; 1500 } 1501 /* skip spaces */ 1502 while(*incfile == ' ' || *incfile == '\t') 1503 incfile++; 1504 /* adjust for chroot on include file */ 1505 if(cfg->chrootdir && cfg->chrootdir[0] && 1506 strncmp(incfile, cfg->chrootdir, 1507 strlen(cfg->chrootdir)) == 0) 1508 incfile += strlen(cfg->chrootdir); 1509 incfile = strdup(incfile); 1510 if(!incfile) { 1511 log_err("malloc failure"); 1512 return 0; 1513 } 1514 verbose(VERB_ALGO, "opening $INCLUDE %s", 1515 incfile); 1516 inc = fopen(incfile, "r"); 1517 if(!inc) { 1518 log_err("%s:%d cannot open include " 1519 "file %s: %s", fname, 1520 lineno_orig, incfile, 1521 strerror(errno)); 1522 free(incfile); 1523 return 0; 1524 } 1525 /* recurse read that file now */ 1526 if(!az_parse_file(z, inc, rr, rrbuflen, 1527 state, incfile, depth+1, cfg)) { 1528 log_err("%s:%d cannot parse include " 1529 "file %s", fname, 1530 lineno_orig, incfile); 1531 fclose(inc); 1532 free(incfile); 1533 return 0; 1534 } 1535 fclose(inc); 1536 verbose(VERB_ALGO, "done with $INCLUDE %s", 1537 incfile); 1538 free(incfile); 1539 state->lineno = lineno_orig; 1540 } 1541 continue; 1542 } 1543 if(status != 0) { 1544 log_err("parse error %s %d:%d: %s", fname, 1545 state->lineno, LDNS_WIREPARSE_OFFSET(status), 1546 sldns_get_errorstr_parse(status)); 1547 return 0; 1548 } 1549 if(rr_len == 0) { 1550 /* EMPTY line, TTL or ORIGIN */ 1551 continue; 1552 } 1553 /* insert wirerr in rrbuf */ 1554 if(!az_insert_rr(z, rr, rr_len, dname_len, NULL)) { 1555 char buf[17]; 1556 sldns_wire2str_type_buf(sldns_wirerr_get_type(rr, 1557 rr_len, dname_len), buf, sizeof(buf)); 1558 log_err("%s:%d cannot insert RR of type %s", 1559 fname, state->lineno, buf); 1560 return 0; 1561 } 1562 } 1563 return 1; 1564 } 1565 1566 int 1567 auth_zone_read_zonefile(struct auth_zone* z, struct config_file* cfg) 1568 { 1569 uint8_t rr[LDNS_RR_BUF_SIZE]; 1570 struct sldns_file_parse_state state; 1571 char* zfilename; 1572 FILE* in; 1573 if(!z || !z->zonefile || z->zonefile[0]==0) 1574 return 1; /* no file, or "", nothing to read */ 1575 1576 zfilename = z->zonefile; 1577 if(cfg->chrootdir && cfg->chrootdir[0] && strncmp(zfilename, 1578 cfg->chrootdir, strlen(cfg->chrootdir)) == 0) 1579 zfilename += strlen(cfg->chrootdir); 1580 if(verbosity >= VERB_ALGO) { 1581 char nm[255+1]; 1582 dname_str(z->name, nm); 1583 verbose(VERB_ALGO, "read zonefile %s for %s", zfilename, nm); 1584 } 1585 in = fopen(zfilename, "r"); 1586 if(!in) { 1587 char* n = sldns_wire2str_dname(z->name, z->namelen); 1588 if(z->zone_is_slave && errno == ENOENT) { 1589 /* we fetch the zone contents later, no file yet */ 1590 verbose(VERB_ALGO, "no zonefile %s for %s", 1591 zfilename, n?n:"error"); 1592 free(n); 1593 return 1; 1594 } 1595 log_err("cannot open zonefile %s for %s: %s", 1596 zfilename, n?n:"error", strerror(errno)); 1597 free(n); 1598 return 0; 1599 } 1600 1601 /* clear the data tree */ 1602 traverse_postorder(&z->data, auth_data_del, NULL); 1603 rbtree_init(&z->data, &auth_data_cmp); 1604 /* clear the RPZ policies */ 1605 if(z->rpz) 1606 rpz_clear(z->rpz); 1607 1608 memset(&state, 0, sizeof(state)); 1609 /* default TTL to 3600 */ 1610 state.default_ttl = 3600; 1611 /* set $ORIGIN to the zone name */ 1612 if(z->namelen <= sizeof(state.origin)) { 1613 memcpy(state.origin, z->name, z->namelen); 1614 state.origin_len = z->namelen; 1615 } 1616 /* parse the (toplevel) file */ 1617 if(!az_parse_file(z, in, rr, sizeof(rr), &state, zfilename, 0, cfg)) { 1618 char* n = sldns_wire2str_dname(z->name, z->namelen); 1619 log_err("error parsing zonefile %s for %s", 1620 zfilename, n?n:"error"); 1621 free(n); 1622 fclose(in); 1623 return 0; 1624 } 1625 fclose(in); 1626 1627 if(z->rpz) 1628 rpz_finish_config(z->rpz); 1629 return 1; 1630 } 1631 1632 /** write buffer to file and check return codes */ 1633 static int 1634 write_out(FILE* out, const char* str, size_t len) 1635 { 1636 size_t r; 1637 if(len == 0) 1638 return 1; 1639 r = fwrite(str, 1, len, out); 1640 if(r == 0) { 1641 log_err("write failed: %s", strerror(errno)); 1642 return 0; 1643 } else if(r < len) { 1644 log_err("write failed: too short (disk full?)"); 1645 return 0; 1646 } 1647 return 1; 1648 } 1649 1650 /** convert auth rr to string */ 1651 static int 1652 auth_rr_to_string(uint8_t* nm, size_t nmlen, uint16_t tp, uint16_t cl, 1653 struct packed_rrset_data* data, size_t i, char* s, size_t buflen) 1654 { 1655 int w = 0; 1656 size_t slen = buflen, datlen; 1657 uint8_t* dat; 1658 if(i >= data->count) tp = LDNS_RR_TYPE_RRSIG; 1659 dat = nm; 1660 datlen = nmlen; 1661 w += sldns_wire2str_dname_scan(&dat, &datlen, &s, &slen, NULL, 0, NULL); 1662 w += sldns_str_print(&s, &slen, "\t"); 1663 w += sldns_str_print(&s, &slen, "%lu\t", (unsigned long)data->rr_ttl[i]); 1664 w += sldns_wire2str_class_print(&s, &slen, cl); 1665 w += sldns_str_print(&s, &slen, "\t"); 1666 w += sldns_wire2str_type_print(&s, &slen, tp); 1667 w += sldns_str_print(&s, &slen, "\t"); 1668 datlen = data->rr_len[i]-2; 1669 dat = data->rr_data[i]+2; 1670 w += sldns_wire2str_rdata_scan(&dat, &datlen, &s, &slen, tp, NULL, 0, NULL); 1671 1672 if(tp == LDNS_RR_TYPE_DNSKEY) { 1673 w += sldns_str_print(&s, &slen, " ;{id = %u}", 1674 sldns_calc_keytag_raw(data->rr_data[i]+2, 1675 data->rr_len[i]-2)); 1676 } 1677 w += sldns_str_print(&s, &slen, "\n"); 1678 1679 if(w >= (int)buflen) { 1680 log_nametypeclass(NO_VERBOSE, "RR too long to print", nm, tp, cl); 1681 return 0; 1682 } 1683 return 1; 1684 } 1685 1686 /** write rrset to file */ 1687 static int 1688 auth_zone_write_rrset(struct auth_zone* z, struct auth_data* node, 1689 struct auth_rrset* r, FILE* out) 1690 { 1691 size_t i, count = r->data->count + r->data->rrsig_count; 1692 char buf[LDNS_RR_BUF_SIZE]; 1693 for(i=0; i<count; i++) { 1694 if(!auth_rr_to_string(node->name, node->namelen, r->type, 1695 z->dclass, r->data, i, buf, sizeof(buf))) { 1696 verbose(VERB_ALGO, "failed to rr2str rr %d", (int)i); 1697 continue; 1698 } 1699 if(!write_out(out, buf, strlen(buf))) 1700 return 0; 1701 } 1702 return 1; 1703 } 1704 1705 /** write domain to file */ 1706 static int 1707 auth_zone_write_domain(struct auth_zone* z, struct auth_data* n, FILE* out) 1708 { 1709 struct auth_rrset* r; 1710 /* if this is zone apex, write SOA first */ 1711 if(z->namelen == n->namelen) { 1712 struct auth_rrset* soa = az_domain_rrset(n, LDNS_RR_TYPE_SOA); 1713 if(soa) { 1714 if(!auth_zone_write_rrset(z, n, soa, out)) 1715 return 0; 1716 } 1717 } 1718 /* write all the RRsets for this domain */ 1719 for(r = n->rrsets; r; r = r->next) { 1720 if(z->namelen == n->namelen && 1721 r->type == LDNS_RR_TYPE_SOA) 1722 continue; /* skip SOA here */ 1723 if(!auth_zone_write_rrset(z, n, r, out)) 1724 return 0; 1725 } 1726 return 1; 1727 } 1728 1729 int auth_zone_write_file(struct auth_zone* z, const char* fname) 1730 { 1731 FILE* out; 1732 struct auth_data* n; 1733 out = fopen(fname, "w"); 1734 if(!out) { 1735 log_err("could not open %s: %s", fname, strerror(errno)); 1736 return 0; 1737 } 1738 RBTREE_FOR(n, struct auth_data*, &z->data) { 1739 if(!auth_zone_write_domain(z, n, out)) { 1740 log_err("could not write domain to %s", fname); 1741 fclose(out); 1742 return 0; 1743 } 1744 } 1745 fclose(out); 1746 return 1; 1747 } 1748 1749 /** offline verify for zonemd, while reading a zone file to immediately 1750 * spot bad hashes in zonefile as they are read. 1751 * Creates temp buffers, but uses anchors and validation environment 1752 * from the module_env. */ 1753 static void 1754 zonemd_offline_verify(struct auth_zone* z, struct module_env* env_for_val, 1755 struct module_stack* mods) 1756 { 1757 struct module_env env; 1758 time_t now = 0; 1759 if(!z->zonemd_check) 1760 return; 1761 env = *env_for_val; 1762 env.scratch_buffer = sldns_buffer_new(env.cfg->msg_buffer_size); 1763 if(!env.scratch_buffer) { 1764 log_err("out of memory"); 1765 goto clean_exit; 1766 } 1767 env.scratch = regional_create(); 1768 if(!env.now) { 1769 env.now = &now; 1770 now = time(NULL); 1771 } 1772 if(!env.scratch) { 1773 log_err("out of memory"); 1774 goto clean_exit; 1775 } 1776 auth_zone_verify_zonemd(z, &env, mods, NULL, 1, 0); 1777 1778 clean_exit: 1779 /* clean up and exit */ 1780 sldns_buffer_free(env.scratch_buffer); 1781 regional_destroy(env.scratch); 1782 } 1783 1784 /** read all auth zones from file (if they have) */ 1785 static int 1786 auth_zones_read_zones(struct auth_zones* az, struct config_file* cfg, 1787 struct module_env* env, struct module_stack* mods) 1788 { 1789 struct auth_zone* z; 1790 lock_rw_wrlock(&az->lock); 1791 RBTREE_FOR(z, struct auth_zone*, &az->ztree) { 1792 lock_rw_wrlock(&z->lock); 1793 if(!auth_zone_read_zonefile(z, cfg)) { 1794 lock_rw_unlock(&z->lock); 1795 lock_rw_unlock(&az->lock); 1796 return 0; 1797 } 1798 if(z->zonefile && z->zonefile[0]!=0 && env) 1799 zonemd_offline_verify(z, env, mods); 1800 lock_rw_unlock(&z->lock); 1801 } 1802 lock_rw_unlock(&az->lock); 1803 return 1; 1804 } 1805 1806 /** fetch the content of a ZONEMD RR from the rdata */ 1807 static int zonemd_fetch_parameters(struct auth_rrset* zonemd_rrset, size_t i, 1808 uint32_t* serial, int* scheme, int* hashalgo, uint8_t** hash, 1809 size_t* hashlen) 1810 { 1811 size_t rr_len; 1812 uint8_t* rdata; 1813 if(i >= zonemd_rrset->data->count) 1814 return 0; 1815 rr_len = zonemd_rrset->data->rr_len[i]; 1816 if(rr_len < 2+4+1+1) 1817 return 0; /* too short, for rdlen+serial+scheme+algo */ 1818 rdata = zonemd_rrset->data->rr_data[i]; 1819 *serial = sldns_read_uint32(rdata+2); 1820 *scheme = rdata[6]; 1821 *hashalgo = rdata[7]; 1822 *hashlen = rr_len - 8; 1823 if(*hashlen == 0) 1824 *hash = NULL; 1825 else *hash = rdata+8; 1826 return 1; 1827 } 1828 1829 /** 1830 * See if the ZONEMD scheme, hash occurs more than once. 1831 * @param zonemd_rrset: the zonemd rrset to check with the RRs in it. 1832 * @param index: index of the original, this is allowed to have that 1833 * scheme and hashalgo, but other RRs should not have it. 1834 * @param scheme: the scheme to check for. 1835 * @param hashalgo: the hash algorithm to check for. 1836 * @return true if it occurs more than once. 1837 */ 1838 static int zonemd_is_duplicate_scheme_hash(struct auth_rrset* zonemd_rrset, 1839 size_t index, int scheme, int hashalgo) 1840 { 1841 size_t j; 1842 for(j=0; j<zonemd_rrset->data->count; j++) { 1843 uint32_t serial2 = 0; 1844 int scheme2 = 0, hashalgo2 = 0; 1845 uint8_t* hash2 = NULL; 1846 size_t hashlen2 = 0; 1847 if(index == j) { 1848 /* this is the original */ 1849 continue; 1850 } 1851 if(!zonemd_fetch_parameters(zonemd_rrset, j, &serial2, 1852 &scheme2, &hashalgo2, &hash2, &hashlen2)) { 1853 /* malformed, skip it */ 1854 continue; 1855 } 1856 if(scheme == scheme2 && hashalgo == hashalgo2) { 1857 /* duplicate scheme, hash */ 1858 verbose(VERB_ALGO, "zonemd duplicate for scheme %d " 1859 "and hash %d", scheme, hashalgo); 1860 return 1; 1861 } 1862 } 1863 return 0; 1864 } 1865 1866 /** 1867 * Check ZONEMDs if present for the auth zone. Depending on config 1868 * it can warn or fail on that. Checks the hash of the ZONEMD. 1869 * @param z: auth zone to check for. 1870 * caller must hold lock on zone. 1871 * @param env: module env for temp buffers. 1872 * @param reason: returned on failure. 1873 * @return false on failure, true if hash checks out. 1874 */ 1875 static int auth_zone_zonemd_check_hash(struct auth_zone* z, 1876 struct module_env* env, char** reason) 1877 { 1878 /* loop over ZONEMDs and see which one is valid. if not print 1879 * failure (depending on config) */ 1880 struct auth_data* apex; 1881 struct auth_rrset* zonemd_rrset; 1882 size_t i; 1883 struct regional* region = NULL; 1884 struct sldns_buffer* buf = NULL; 1885 uint32_t soa_serial = 0; 1886 char* unsupported_reason = NULL; 1887 int only_unsupported = 1; 1888 region = env->scratch; 1889 regional_free_all(region); 1890 buf = env->scratch_buffer; 1891 if(!auth_zone_get_serial(z, &soa_serial)) { 1892 *reason = "zone has no SOA serial"; 1893 return 0; 1894 } 1895 1896 apex = az_find_name(z, z->name, z->namelen); 1897 if(!apex) { 1898 *reason = "zone has no apex"; 1899 return 0; 1900 } 1901 zonemd_rrset = az_domain_rrset(apex, LDNS_RR_TYPE_ZONEMD); 1902 if(!zonemd_rrset || zonemd_rrset->data->count==0) { 1903 *reason = "zone has no ZONEMD"; 1904 return 0; /* no RRset or no RRs in rrset */ 1905 } 1906 1907 /* we have a ZONEMD, check if it is correct */ 1908 for(i=0; i<zonemd_rrset->data->count; i++) { 1909 uint32_t serial = 0; 1910 int scheme = 0, hashalgo = 0; 1911 uint8_t* hash = NULL; 1912 size_t hashlen = 0; 1913 if(!zonemd_fetch_parameters(zonemd_rrset, i, &serial, &scheme, 1914 &hashalgo, &hash, &hashlen)) { 1915 /* malformed RR */ 1916 *reason = "ZONEMD rdata malformed"; 1917 only_unsupported = 0; 1918 continue; 1919 } 1920 /* check for duplicates */ 1921 if(zonemd_is_duplicate_scheme_hash(zonemd_rrset, i, scheme, 1922 hashalgo)) { 1923 /* duplicate hash of the same scheme,hash 1924 * is not allowed. */ 1925 *reason = "ZONEMD RRSet contains more than one RR " 1926 "with the same scheme and hash algorithm"; 1927 only_unsupported = 0; 1928 continue; 1929 } 1930 regional_free_all(region); 1931 if(serial != soa_serial) { 1932 *reason = "ZONEMD serial is wrong"; 1933 only_unsupported = 0; 1934 continue; 1935 } 1936 *reason = NULL; 1937 if(auth_zone_generate_zonemd_check(z, scheme, hashalgo, 1938 hash, hashlen, region, buf, reason)) { 1939 /* success */ 1940 if(*reason) { 1941 if(!unsupported_reason) 1942 unsupported_reason = *reason; 1943 /* continue to check for valid ZONEMD */ 1944 if(verbosity >= VERB_ALGO) { 1945 char zstr[255+1]; 1946 dname_str(z->name, zstr); 1947 verbose(VERB_ALGO, "auth-zone %s ZONEMD %d %d is unsupported: %s", zstr, (int)scheme, (int)hashalgo, *reason); 1948 } 1949 *reason = NULL; 1950 continue; 1951 } 1952 if(verbosity >= VERB_ALGO) { 1953 char zstr[255+1]; 1954 dname_str(z->name, zstr); 1955 if(!*reason) 1956 verbose(VERB_ALGO, "auth-zone %s ZONEMD hash is correct", zstr); 1957 } 1958 return 1; 1959 } 1960 only_unsupported = 0; 1961 /* try next one */ 1962 } 1963 /* have we seen no failures but only unsupported algo, 1964 * and one unsupported algorithm, or more. */ 1965 if(only_unsupported && unsupported_reason) { 1966 /* only unsupported algorithms, with valid serial, not 1967 * malformed. Did not see supported algorithms, failed or 1968 * successful ones. */ 1969 *reason = unsupported_reason; 1970 return 1; 1971 } 1972 /* fail, we may have reason */ 1973 if(!*reason) 1974 *reason = "no ZONEMD records found"; 1975 if(verbosity >= VERB_ALGO) { 1976 char zstr[255+1]; 1977 dname_str(z->name, zstr); 1978 verbose(VERB_ALGO, "auth-zone %s ZONEMD failed: %s", zstr, *reason); 1979 } 1980 return 0; 1981 } 1982 1983 /** find the apex SOA RRset, if it exists */ 1984 struct auth_rrset* auth_zone_get_soa_rrset(struct auth_zone* z) 1985 { 1986 struct auth_data* apex; 1987 struct auth_rrset* soa; 1988 apex = az_find_name(z, z->name, z->namelen); 1989 if(!apex) return NULL; 1990 soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA); 1991 return soa; 1992 } 1993 1994 /** find serial number of zone or false if none */ 1995 int 1996 auth_zone_get_serial(struct auth_zone* z, uint32_t* serial) 1997 { 1998 struct auth_data* apex; 1999 struct auth_rrset* soa; 2000 struct packed_rrset_data* d; 2001 apex = az_find_name(z, z->name, z->namelen); 2002 if(!apex) return 0; 2003 soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA); 2004 if(!soa || soa->data->count==0) 2005 return 0; /* no RRset or no RRs in rrset */ 2006 if(soa->data->rr_len[0] < 2+4*5) return 0; /* SOA too short */ 2007 d = soa->data; 2008 *serial = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-20)); 2009 return 1; 2010 } 2011 2012 /** Find auth_zone SOA and populate the values in xfr(soa values). */ 2013 int 2014 xfr_find_soa(struct auth_zone* z, struct auth_xfer* xfr) 2015 { 2016 struct auth_data* apex; 2017 struct auth_rrset* soa; 2018 struct packed_rrset_data* d; 2019 apex = az_find_name(z, z->name, z->namelen); 2020 if(!apex) return 0; 2021 soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA); 2022 if(!soa || soa->data->count==0) 2023 return 0; /* no RRset or no RRs in rrset */ 2024 if(soa->data->rr_len[0] < 2+4*5) return 0; /* SOA too short */ 2025 /* SOA record ends with serial, refresh, retry, expiry, minimum, 2026 * as 4 byte fields */ 2027 d = soa->data; 2028 xfr->have_zone = 1; 2029 xfr->serial = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-20)); 2030 xfr->refresh = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-16)); 2031 xfr->retry = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-12)); 2032 xfr->expiry = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-8)); 2033 /* soa minimum at d->rr_len[0]-4 */ 2034 return 1; 2035 } 2036 2037 /** 2038 * Setup auth_xfer zone 2039 * This populates the have_zone, soa values, and so on times. 2040 * Doesn't do network traffic yet, can set option flags. 2041 * @param z: locked by caller, and modified for setup 2042 * @param x: locked by caller, and modified. 2043 * @return false on failure. 2044 */ 2045 static int 2046 auth_xfer_setup(struct auth_zone* z, struct auth_xfer* x) 2047 { 2048 /* for a zone without zone transfers, x==NULL, so skip them, 2049 * i.e. the zone config is fixed with no masters or urls */ 2050 if(!z || !x) return 1; 2051 if(!xfr_find_soa(z, x)) { 2052 return 1; 2053 } 2054 /* nothing for probe, nextprobe and transfer tasks */ 2055 return 1; 2056 } 2057 2058 /** 2059 * Setup all zones 2060 * @param az: auth zones structure 2061 * @return false on failure. 2062 */ 2063 static int 2064 auth_zones_setup_zones(struct auth_zones* az) 2065 { 2066 struct auth_zone* z; 2067 struct auth_xfer* x; 2068 lock_rw_wrlock(&az->lock); 2069 RBTREE_FOR(z, struct auth_zone*, &az->ztree) { 2070 lock_rw_wrlock(&z->lock); 2071 x = auth_xfer_find(az, z->name, z->namelen, z->dclass); 2072 if(x) { 2073 lock_basic_lock(&x->lock); 2074 } 2075 if(!auth_xfer_setup(z, x)) { 2076 if(x) { 2077 lock_basic_unlock(&x->lock); 2078 } 2079 lock_rw_unlock(&z->lock); 2080 lock_rw_unlock(&az->lock); 2081 return 0; 2082 } 2083 if(x) { 2084 lock_basic_unlock(&x->lock); 2085 } 2086 lock_rw_unlock(&z->lock); 2087 } 2088 lock_rw_unlock(&az->lock); 2089 return 1; 2090 } 2091 2092 /** set config items and create zones */ 2093 static int 2094 auth_zones_cfg(struct auth_zones* az, struct config_auth* c) 2095 { 2096 struct auth_zone* z; 2097 struct auth_xfer* x = NULL; 2098 2099 /* create zone */ 2100 if(c->isrpz) { 2101 /* if the rpz lock is needed, grab it before the other 2102 * locks to avoid a lock dependency cycle */ 2103 lock_rw_wrlock(&az->rpz_lock); 2104 } 2105 lock_rw_wrlock(&az->lock); 2106 if(!(z=auth_zones_find_or_add_zone(az, c->name))) { 2107 lock_rw_unlock(&az->lock); 2108 if(c->isrpz) { 2109 lock_rw_unlock(&az->rpz_lock); 2110 } 2111 return 0; 2112 } 2113 if(c->masters || c->urls) { 2114 if(!(x=auth_zones_find_or_add_xfer(az, z))) { 2115 lock_rw_unlock(&az->lock); 2116 lock_rw_unlock(&z->lock); 2117 if(c->isrpz) { 2118 lock_rw_unlock(&az->rpz_lock); 2119 } 2120 return 0; 2121 } 2122 } 2123 if(c->for_downstream) 2124 az->have_downstream = 1; 2125 lock_rw_unlock(&az->lock); 2126 2127 /* set options */ 2128 z->zone_deleted = 0; 2129 if(!auth_zone_set_zonefile(z, c->zonefile)) { 2130 if(x) { 2131 lock_basic_unlock(&x->lock); 2132 } 2133 lock_rw_unlock(&z->lock); 2134 if(c->isrpz) { 2135 lock_rw_unlock(&az->rpz_lock); 2136 } 2137 return 0; 2138 } 2139 z->for_downstream = c->for_downstream; 2140 z->for_upstream = c->for_upstream; 2141 z->fallback_enabled = c->fallback_enabled; 2142 z->zonemd_check = c->zonemd_check; 2143 z->zonemd_reject_absence = c->zonemd_reject_absence; 2144 if(c->isrpz && !z->rpz){ 2145 if(!(z->rpz = rpz_create(c))){ 2146 fatal_exit("Could not setup RPZ zones"); 2147 return 0; 2148 } 2149 lock_protect(&z->lock, &z->rpz->local_zones, sizeof(*z->rpz)); 2150 /* the az->rpz_lock is locked above */ 2151 z->rpz_az_next = az->rpz_first; 2152 if(az->rpz_first) 2153 az->rpz_first->rpz_az_prev = z; 2154 az->rpz_first = z; 2155 } else if(c->isrpz && z->rpz) { 2156 if(!rpz_config(z->rpz, c)) { 2157 log_err("Could not change rpz config"); 2158 if(x) { 2159 lock_basic_unlock(&x->lock); 2160 } 2161 lock_rw_unlock(&z->lock); 2162 lock_rw_unlock(&az->rpz_lock); 2163 return 0; 2164 } 2165 } 2166 if(c->isrpz) { 2167 lock_rw_unlock(&az->rpz_lock); 2168 } 2169 2170 /* xfer zone */ 2171 if(x) { 2172 z->zone_is_slave = 1; 2173 /* set options on xfer zone */ 2174 if(!xfer_set_masters(&x->task_probe->masters, c, 0)) { 2175 lock_basic_unlock(&x->lock); 2176 lock_rw_unlock(&z->lock); 2177 return 0; 2178 } 2179 if(!xfer_set_masters(&x->task_transfer->masters, c, 1)) { 2180 lock_basic_unlock(&x->lock); 2181 lock_rw_unlock(&z->lock); 2182 return 0; 2183 } 2184 lock_basic_unlock(&x->lock); 2185 } 2186 2187 lock_rw_unlock(&z->lock); 2188 return 1; 2189 } 2190 2191 /** set all auth zones deleted, then in auth_zones_cfg, it marks them 2192 * as nondeleted (if they are still in the config), and then later 2193 * we can find deleted zones */ 2194 static void 2195 az_setall_deleted(struct auth_zones* az) 2196 { 2197 struct auth_zone* z; 2198 lock_rw_wrlock(&az->lock); 2199 RBTREE_FOR(z, struct auth_zone*, &az->ztree) { 2200 lock_rw_wrlock(&z->lock); 2201 z->zone_deleted = 1; 2202 lock_rw_unlock(&z->lock); 2203 } 2204 lock_rw_unlock(&az->lock); 2205 } 2206 2207 /** find zones that are marked deleted and delete them. 2208 * This is called from apply_cfg, and there are no threads and no 2209 * workers, so the xfr can just be deleted. */ 2210 static void 2211 az_delete_deleted_zones(struct auth_zones* az) 2212 { 2213 struct auth_zone* z; 2214 struct auth_zone* delete_list = NULL, *next; 2215 struct auth_xfer* xfr; 2216 lock_rw_wrlock(&az->lock); 2217 RBTREE_FOR(z, struct auth_zone*, &az->ztree) { 2218 lock_rw_wrlock(&z->lock); 2219 if(z->zone_deleted) { 2220 /* we cannot alter the rbtree right now, but 2221 * we can put it on a linked list and then 2222 * delete it */ 2223 z->delete_next = delete_list; 2224 delete_list = z; 2225 } 2226 lock_rw_unlock(&z->lock); 2227 } 2228 /* now we are out of the tree loop and we can loop and delete 2229 * the zones */ 2230 z = delete_list; 2231 while(z) { 2232 next = z->delete_next; 2233 xfr = auth_xfer_find(az, z->name, z->namelen, z->dclass); 2234 if(xfr) { 2235 (void)rbtree_delete(&az->xtree, &xfr->node); 2236 auth_xfer_delete(xfr); 2237 } 2238 (void)rbtree_delete(&az->ztree, &z->node); 2239 auth_zone_delete(z, az); 2240 z = next; 2241 } 2242 lock_rw_unlock(&az->lock); 2243 } 2244 2245 int auth_zones_apply_cfg(struct auth_zones* az, struct config_file* cfg, 2246 int setup, int* is_rpz, struct module_env* env, 2247 struct module_stack* mods) 2248 { 2249 struct config_auth* p; 2250 az_setall_deleted(az); 2251 for(p = cfg->auths; p; p = p->next) { 2252 if(!p->name || p->name[0] == 0) { 2253 log_warn("auth-zone without a name, skipped"); 2254 continue; 2255 } 2256 *is_rpz = (*is_rpz || p->isrpz); 2257 if(!auth_zones_cfg(az, p)) { 2258 log_err("cannot config auth zone %s", p->name); 2259 return 0; 2260 } 2261 } 2262 az_delete_deleted_zones(az); 2263 if(!auth_zones_read_zones(az, cfg, env, mods)) 2264 return 0; 2265 if(setup) { 2266 if(!auth_zones_setup_zones(az)) 2267 return 0; 2268 } 2269 return 1; 2270 } 2271 2272 /** delete chunks 2273 * @param at: transfer structure with chunks list. The chunks and their 2274 * data are freed. 2275 */ 2276 static void 2277 auth_chunks_delete(struct auth_transfer* at) 2278 { 2279 if(at->chunks_first) { 2280 struct auth_chunk* c, *cn; 2281 c = at->chunks_first; 2282 while(c) { 2283 cn = c->next; 2284 free(c->data); 2285 free(c); 2286 c = cn; 2287 } 2288 } 2289 at->chunks_first = NULL; 2290 at->chunks_last = NULL; 2291 } 2292 2293 /** free master addr list */ 2294 static void 2295 auth_free_master_addrs(struct auth_addr* list) 2296 { 2297 struct auth_addr *n; 2298 while(list) { 2299 n = list->next; 2300 free(list); 2301 list = n; 2302 } 2303 } 2304 2305 /** free the masters list */ 2306 static void 2307 auth_free_masters(struct auth_master* list) 2308 { 2309 struct auth_master* n; 2310 while(list) { 2311 n = list->next; 2312 auth_free_master_addrs(list->list); 2313 free(list->host); 2314 free(list->file); 2315 free(list); 2316 list = n; 2317 } 2318 } 2319 2320 /** delete auth xfer structure 2321 * @param xfr: delete this xfer and its tasks. 2322 */ 2323 static void 2324 auth_xfer_delete(struct auth_xfer* xfr) 2325 { 2326 if(!xfr) return; 2327 lock_basic_destroy(&xfr->lock); 2328 free(xfr->name); 2329 if(xfr->task_nextprobe) { 2330 comm_timer_delete(xfr->task_nextprobe->timer); 2331 free(xfr->task_nextprobe); 2332 } 2333 if(xfr->task_probe) { 2334 auth_free_masters(xfr->task_probe->masters); 2335 comm_point_delete(xfr->task_probe->cp); 2336 comm_timer_delete(xfr->task_probe->timer); 2337 free(xfr->task_probe); 2338 } 2339 if(xfr->task_transfer) { 2340 auth_free_masters(xfr->task_transfer->masters); 2341 comm_point_delete(xfr->task_transfer->cp); 2342 comm_timer_delete(xfr->task_transfer->timer); 2343 if(xfr->task_transfer->chunks_first) { 2344 auth_chunks_delete(xfr->task_transfer); 2345 } 2346 free(xfr->task_transfer); 2347 } 2348 auth_free_masters(xfr->allow_notify_list); 2349 free(xfr); 2350 } 2351 2352 /** helper traverse to delete zones */ 2353 static void 2354 auth_zone_del(rbnode_type* n, void* ATTR_UNUSED(arg)) 2355 { 2356 struct auth_zone* z = (struct auth_zone*)n->key; 2357 auth_zone_delete(z, NULL); 2358 } 2359 2360 /** helper traverse to delete xfer zones */ 2361 static void 2362 auth_xfer_del(rbnode_type* n, void* ATTR_UNUSED(arg)) 2363 { 2364 struct auth_xfer* z = (struct auth_xfer*)n->key; 2365 auth_xfer_delete(z); 2366 } 2367 2368 void auth_zones_delete(struct auth_zones* az) 2369 { 2370 if(!az) return; 2371 lock_rw_destroy(&az->lock); 2372 lock_rw_destroy(&az->rpz_lock); 2373 traverse_postorder(&az->ztree, auth_zone_del, NULL); 2374 traverse_postorder(&az->xtree, auth_xfer_del, NULL); 2375 free(az); 2376 } 2377 2378 /** true if domain has only nsec3 */ 2379 static int 2380 domain_has_only_nsec3(struct auth_data* n) 2381 { 2382 struct auth_rrset* rrset = n->rrsets; 2383 int nsec3_seen = 0; 2384 while(rrset) { 2385 if(rrset->type == LDNS_RR_TYPE_NSEC3) { 2386 nsec3_seen = 1; 2387 } else if(rrset->type != LDNS_RR_TYPE_RRSIG) { 2388 return 0; 2389 } 2390 rrset = rrset->next; 2391 } 2392 return nsec3_seen; 2393 } 2394 2395 /** see if the domain has a wildcard child '*.domain' */ 2396 static struct auth_data* 2397 az_find_wildcard_domain(struct auth_zone* z, uint8_t* nm, size_t nmlen) 2398 { 2399 uint8_t wc[LDNS_MAX_DOMAINLEN]; 2400 if(nmlen+2 > sizeof(wc)) 2401 return NULL; /* result would be too long */ 2402 wc[0] = 1; /* length of wildcard label */ 2403 wc[1] = (uint8_t)'*'; /* wildcard label */ 2404 memmove(wc+2, nm, nmlen); 2405 return az_find_name(z, wc, nmlen+2); 2406 } 2407 2408 /** find wildcard between qname and cename */ 2409 static struct auth_data* 2410 az_find_wildcard(struct auth_zone* z, struct query_info* qinfo, 2411 struct auth_data* ce) 2412 { 2413 uint8_t* nm = qinfo->qname; 2414 size_t nmlen = qinfo->qname_len; 2415 struct auth_data* node; 2416 if(!dname_subdomain_c(nm, z->name)) 2417 return NULL; /* out of zone */ 2418 while((node=az_find_wildcard_domain(z, nm, nmlen))==NULL) { 2419 /* see if we can go up to find the wildcard */ 2420 if(nmlen == z->namelen) 2421 return NULL; /* top of zone reached */ 2422 if(ce && nmlen == ce->namelen) 2423 return NULL; /* ce reached */ 2424 if(dname_is_root(nm)) 2425 return NULL; /* cannot go up */ 2426 dname_remove_label(&nm, &nmlen); 2427 } 2428 return node; 2429 } 2430 2431 /** domain is not exact, find first candidate ce (name that matches 2432 * a part of qname) in tree */ 2433 static struct auth_data* 2434 az_find_candidate_ce(struct auth_zone* z, struct query_info* qinfo, 2435 struct auth_data* n) 2436 { 2437 uint8_t* nm; 2438 size_t nmlen; 2439 if(n) { 2440 nm = dname_get_shared_topdomain(qinfo->qname, n->name); 2441 } else { 2442 nm = qinfo->qname; 2443 } 2444 dname_count_size_labels(nm, &nmlen); 2445 n = az_find_name(z, nm, nmlen); 2446 /* delete labels and go up on name */ 2447 while(!n) { 2448 if(dname_is_root(nm)) 2449 return NULL; /* cannot go up */ 2450 dname_remove_label(&nm, &nmlen); 2451 n = az_find_name(z, nm, nmlen); 2452 } 2453 return n; 2454 } 2455 2456 /** go up the auth tree to next existing name. */ 2457 static struct auth_data* 2458 az_domain_go_up(struct auth_zone* z, struct auth_data* n) 2459 { 2460 uint8_t* nm = n->name; 2461 size_t nmlen = n->namelen; 2462 while(!dname_is_root(nm)) { 2463 dname_remove_label(&nm, &nmlen); 2464 if((n=az_find_name(z, nm, nmlen)) != NULL) 2465 return n; 2466 } 2467 return NULL; 2468 } 2469 2470 /** Find the closest encloser, an name that exists and is above the 2471 * qname. 2472 * return true if the node (param node) is existing, nonobscured and 2473 * can be used to generate answers from. It is then also node_exact. 2474 * returns false if the node is not good enough (or it wasn't node_exact) 2475 * in this case the ce can be filled. 2476 * if ce is NULL, no ce exists, and likely the zone is completely empty, 2477 * not even with a zone apex. 2478 * if ce is nonNULL it is the closest enclosing upper name (that exists 2479 * itself for answer purposes). That name may have DNAME, NS or wildcard 2480 * rrset is the closest DNAME or NS rrset that was found. 2481 */ 2482 static int 2483 az_find_ce(struct auth_zone* z, struct query_info* qinfo, 2484 struct auth_data* node, int node_exact, struct auth_data** ce, 2485 struct auth_rrset** rrset) 2486 { 2487 struct auth_data* n = node; 2488 struct auth_rrset* lookrrset; 2489 *ce = NULL; 2490 *rrset = NULL; 2491 if(!node_exact) { 2492 /* if not exact, lookup closest exact match */ 2493 n = az_find_candidate_ce(z, qinfo, n); 2494 } else { 2495 /* if exact, the node itself is the first candidate ce */ 2496 *ce = n; 2497 } 2498 2499 /* no direct answer from nsec3-only domains */ 2500 if(n && domain_has_only_nsec3(n)) { 2501 node_exact = 0; 2502 *ce = NULL; 2503 } 2504 2505 /* with exact matches, walk up the labels until we find the 2506 * delegation, or DNAME or zone end */ 2507 while(n) { 2508 /* see if the current candidate has issues */ 2509 /* not zone apex and has type NS */ 2510 if(n->namelen != z->namelen && 2511 (lookrrset=az_domain_rrset(n, LDNS_RR_TYPE_NS)) && 2512 /* delegate here, but DS at exact the dp has notype */ 2513 (qinfo->qtype != LDNS_RR_TYPE_DS || 2514 n->namelen != qinfo->qname_len)) { 2515 /* referral */ 2516 /* this is ce and the lowernode is nonexisting */ 2517 *ce = n; 2518 *rrset = lookrrset; 2519 node_exact = 0; 2520 } 2521 /* not equal to qname and has type DNAME */ 2522 if(n->namelen != qinfo->qname_len && 2523 (lookrrset=az_domain_rrset(n, LDNS_RR_TYPE_DNAME))) { 2524 /* this is ce and the lowernode is nonexisting */ 2525 *ce = n; 2526 *rrset = lookrrset; 2527 node_exact = 0; 2528 } 2529 2530 if(*ce == NULL && !domain_has_only_nsec3(n)) { 2531 /* if not found yet, this exact name must be 2532 * our lowest match (but not nsec3onlydomain) */ 2533 *ce = n; 2534 } 2535 2536 /* walk up the tree by removing labels from name and lookup */ 2537 n = az_domain_go_up(z, n); 2538 } 2539 /* found no problems, if it was an exact node, it is fine to use */ 2540 return node_exact; 2541 } 2542 2543 /** add additional A/AAAA from domain names in rrset rdata (+offset) 2544 * offset is number of bytes in rdata where the dname is located. */ 2545 static int 2546 az_add_additionals_from(struct auth_zone* z, struct regional* region, 2547 struct dns_msg* msg, struct auth_rrset* rrset, size_t offset) 2548 { 2549 struct packed_rrset_data* d = rrset->data; 2550 size_t i; 2551 if(!d) return 0; 2552 for(i=0; i<d->count; i++) { 2553 size_t dlen; 2554 struct auth_data* domain; 2555 struct auth_rrset* ref; 2556 if(d->rr_len[i] < 2+offset) 2557 continue; /* too short */ 2558 if(!(dlen = dname_valid(d->rr_data[i]+2+offset, 2559 d->rr_len[i]-2-offset))) 2560 continue; /* malformed */ 2561 domain = az_find_name(z, d->rr_data[i]+2+offset, dlen); 2562 if(!domain) 2563 continue; 2564 if((ref=az_domain_rrset(domain, LDNS_RR_TYPE_A)) != NULL) { 2565 if(!msg_add_rrset_ar(z, region, msg, domain, ref)) 2566 return 0; 2567 } 2568 if((ref=az_domain_rrset(domain, LDNS_RR_TYPE_AAAA)) != NULL) { 2569 if(!msg_add_rrset_ar(z, region, msg, domain, ref)) 2570 return 0; 2571 } 2572 } 2573 return 1; 2574 } 2575 2576 /** add negative SOA record (with negative TTL) */ 2577 static int 2578 az_add_negative_soa(struct auth_zone* z, struct regional* region, 2579 struct dns_msg* msg) 2580 { 2581 time_t minimum; 2582 size_t i; 2583 struct packed_rrset_data* d; 2584 struct auth_rrset* soa; 2585 struct auth_data* apex = az_find_name(z, z->name, z->namelen); 2586 if(!apex) return 0; 2587 soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA); 2588 if(!soa) return 0; 2589 /* must be first to put in message; we want to fix the TTL with 2590 * one RRset here, otherwise we'd need to loop over the RRs to get 2591 * the resulting lower TTL */ 2592 log_assert(msg->rep->rrset_count == 0); 2593 if(!msg_add_rrset_ns(z, region, msg, apex, soa)) return 0; 2594 /* fixup TTL */ 2595 d = (struct packed_rrset_data*)msg->rep->rrsets[msg->rep->rrset_count-1]->entry.data; 2596 /* last 4 bytes are minimum ttl in network format */ 2597 if(d->count == 0) return 0; 2598 if(d->rr_len[0] < 2+4) return 0; 2599 minimum = (time_t)sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-4)); 2600 minimum = d->ttl<minimum?d->ttl:minimum; 2601 d->ttl = minimum; 2602 for(i=0; i < d->count + d->rrsig_count; i++) 2603 d->rr_ttl[i] = minimum; 2604 msg->rep->ttl = get_rrset_ttl(msg->rep->rrsets[0]); 2605 msg->rep->prefetch_ttl = PREFETCH_TTL_CALC(msg->rep->ttl); 2606 msg->rep->serve_expired_ttl = msg->rep->ttl + SERVE_EXPIRED_TTL; 2607 return 1; 2608 } 2609 2610 /** See if the query goes to empty nonterminal (that has no auth_data, 2611 * but there are nodes underneath. We already checked that there are 2612 * not NS, or DNAME above, so that we only need to check if some node 2613 * exists below (with nonempty rr list), return true if emptynonterminal */ 2614 static int 2615 az_empty_nonterminal(struct auth_zone* z, struct query_info* qinfo, 2616 struct auth_data* node) 2617 { 2618 struct auth_data* next; 2619 if(!node) { 2620 /* no smaller was found, use first (smallest) node as the 2621 * next one */ 2622 next = (struct auth_data*)rbtree_first(&z->data); 2623 } else { 2624 next = (struct auth_data*)rbtree_next(&node->node); 2625 } 2626 while(next && (rbnode_type*)next != RBTREE_NULL && next->rrsets == NULL) { 2627 /* the next name has empty rrsets, is an empty nonterminal 2628 * itself, see if there exists something below it */ 2629 next = (struct auth_data*)rbtree_next(&node->node); 2630 } 2631 if((rbnode_type*)next == RBTREE_NULL || !next) { 2632 /* there is no next node, so something below it cannot 2633 * exist */ 2634 return 0; 2635 } 2636 /* a next node exists, if there was something below the query, 2637 * this node has to be it. See if it is below the query name */ 2638 if(dname_strict_subdomain_c(next->name, qinfo->qname)) 2639 return 1; 2640 return 0; 2641 } 2642 2643 /** create synth cname target name in buffer, or fail if too long */ 2644 static size_t 2645 synth_cname_buf(uint8_t* qname, size_t qname_len, size_t dname_len, 2646 uint8_t* dtarg, size_t dtarglen, uint8_t* buf, size_t buflen) 2647 { 2648 size_t newlen = qname_len + dtarglen - dname_len; 2649 if(newlen > buflen) { 2650 /* YXDOMAIN error */ 2651 return 0; 2652 } 2653 /* new name is concatenation of qname front (without DNAME owner) 2654 * and DNAME target name */ 2655 memcpy(buf, qname, qname_len-dname_len); 2656 memmove(buf+(qname_len-dname_len), dtarg, dtarglen); 2657 return newlen; 2658 } 2659 2660 /** create synthetic CNAME rrset for in a DNAME answer in region, 2661 * false on alloc failure, cname==NULL when name too long. */ 2662 static int 2663 create_synth_cname(uint8_t* qname, size_t qname_len, struct regional* region, 2664 struct auth_data* node, struct auth_rrset* dname, uint16_t dclass, 2665 struct ub_packed_rrset_key** cname) 2666 { 2667 uint8_t buf[LDNS_MAX_DOMAINLEN]; 2668 uint8_t* dtarg; 2669 size_t dtarglen, newlen; 2670 struct packed_rrset_data* d; 2671 2672 /* get DNAME target name */ 2673 if(dname->data->count < 1) return 0; 2674 if(dname->data->rr_len[0] < 3) return 0; /* at least rdatalen +1 */ 2675 dtarg = dname->data->rr_data[0]+2; 2676 dtarglen = dname->data->rr_len[0]-2; 2677 if(sldns_read_uint16(dname->data->rr_data[0]) != dtarglen) 2678 return 0; /* rdatalen in DNAME rdata is malformed */ 2679 if(dname_valid(dtarg, dtarglen) != dtarglen) 2680 return 0; /* DNAME RR has malformed rdata */ 2681 if(qname_len == 0) 2682 return 0; /* too short */ 2683 if(qname_len <= node->namelen) 2684 return 0; /* qname too short for dname removal */ 2685 2686 /* synthesize a CNAME */ 2687 newlen = synth_cname_buf(qname, qname_len, node->namelen, 2688 dtarg, dtarglen, buf, sizeof(buf)); 2689 if(newlen == 0) { 2690 /* YXDOMAIN error */ 2691 *cname = NULL; 2692 return 1; 2693 } 2694 *cname = (struct ub_packed_rrset_key*)regional_alloc(region, 2695 sizeof(struct ub_packed_rrset_key)); 2696 if(!*cname) 2697 return 0; /* out of memory */ 2698 memset(&(*cname)->entry, 0, sizeof((*cname)->entry)); 2699 (*cname)->entry.key = (*cname); 2700 (*cname)->rk.type = htons(LDNS_RR_TYPE_CNAME); 2701 (*cname)->rk.rrset_class = htons(dclass); 2702 (*cname)->rk.flags = 0; 2703 (*cname)->rk.dname = regional_alloc_init(region, qname, qname_len); 2704 if(!(*cname)->rk.dname) 2705 return 0; /* out of memory */ 2706 (*cname)->rk.dname_len = qname_len; 2707 (*cname)->entry.hash = rrset_key_hash(&(*cname)->rk); 2708 d = (struct packed_rrset_data*)regional_alloc_zero(region, 2709 sizeof(struct packed_rrset_data) + sizeof(size_t) + 2710 sizeof(uint8_t*) + sizeof(time_t) + sizeof(uint16_t) 2711 + newlen); 2712 if(!d) 2713 return 0; /* out of memory */ 2714 (*cname)->entry.data = d; 2715 d->ttl = dname->data->ttl; /* RFC6672: synth CNAME TTL == DNAME TTL */ 2716 d->count = 1; 2717 d->rrsig_count = 0; 2718 d->trust = rrset_trust_ans_noAA; 2719 d->rr_len = (size_t*)((uint8_t*)d + 2720 sizeof(struct packed_rrset_data)); 2721 d->rr_len[0] = newlen + sizeof(uint16_t); 2722 packed_rrset_ptr_fixup(d); 2723 d->rr_ttl[0] = d->ttl; 2724 sldns_write_uint16(d->rr_data[0], newlen); 2725 memmove(d->rr_data[0] + sizeof(uint16_t), buf, newlen); 2726 return 1; 2727 } 2728 2729 /** add a synthesized CNAME to the answer section */ 2730 static int 2731 add_synth_cname(struct auth_zone* z, uint8_t* qname, size_t qname_len, 2732 struct regional* region, struct dns_msg* msg, struct auth_data* dname, 2733 struct auth_rrset* rrset) 2734 { 2735 struct ub_packed_rrset_key* cname; 2736 /* synthesize a CNAME */ 2737 if(!create_synth_cname(qname, qname_len, region, dname, rrset, 2738 z->dclass, &cname)) { 2739 /* out of memory */ 2740 return 0; 2741 } 2742 if(!cname) { 2743 /* cname cannot be create because of YXDOMAIN */ 2744 msg->rep->flags |= LDNS_RCODE_YXDOMAIN; 2745 return 1; 2746 } 2747 /* add cname to message */ 2748 if(!msg_grow_array(region, msg)) 2749 return 0; 2750 msg->rep->rrsets[msg->rep->rrset_count] = cname; 2751 msg->rep->rrset_count++; 2752 msg->rep->an_numrrsets++; 2753 msg_ttl(msg); 2754 return 1; 2755 } 2756 2757 /** Change a dname to a different one, for wildcard namechange */ 2758 static void 2759 az_change_dnames(struct dns_msg* msg, uint8_t* oldname, uint8_t* newname, 2760 size_t newlen, int an_only) 2761 { 2762 size_t i; 2763 size_t start = 0, end = msg->rep->rrset_count; 2764 if(!an_only) start = msg->rep->an_numrrsets; 2765 if(an_only) end = msg->rep->an_numrrsets; 2766 for(i=start; i<end; i++) { 2767 /* allocated in region so we can change the ptrs */ 2768 if(query_dname_compare(msg->rep->rrsets[i]->rk.dname, oldname) 2769 == 0) { 2770 msg->rep->rrsets[i]->rk.dname = newname; 2771 msg->rep->rrsets[i]->rk.dname_len = newlen; 2772 msg->rep->rrsets[i]->entry.hash = rrset_key_hash(&msg->rep->rrsets[i]->rk); 2773 } 2774 } 2775 } 2776 2777 /** find NSEC record covering the query */ 2778 static struct auth_rrset* 2779 az_find_nsec_cover(struct auth_zone* z, struct auth_data** node) 2780 { 2781 uint8_t* nm = (*node)->name; 2782 size_t nmlen = (*node)->namelen; 2783 struct auth_rrset* rrset; 2784 /* find the NSEC for the smallest-or-equal node */ 2785 /* if node == NULL, we did not find a smaller name. But the zone 2786 * name is the smallest name and should have an NSEC. So there is 2787 * no NSEC to return (for a properly signed zone) */ 2788 /* for empty nonterminals, the auth-data node should not exist, 2789 * and thus we don't need to go rbtree_previous here to find 2790 * a domain with an NSEC record */ 2791 /* but there could be glue, and if this is node, then it has no NSEC. 2792 * Go up to find nonglue (previous) NSEC-holding nodes */ 2793 while((rrset=az_domain_rrset(*node, LDNS_RR_TYPE_NSEC)) == NULL) { 2794 if(dname_is_root(nm)) return NULL; 2795 if(nmlen == z->namelen) return NULL; 2796 dname_remove_label(&nm, &nmlen); 2797 /* adjust *node for the nsec rrset to find in */ 2798 *node = az_find_name(z, nm, nmlen); 2799 } 2800 return rrset; 2801 } 2802 2803 /** Find NSEC and add for wildcard denial */ 2804 static int 2805 az_nsec_wildcard_denial(struct auth_zone* z, struct regional* region, 2806 struct dns_msg* msg, uint8_t* cenm, size_t cenmlen) 2807 { 2808 struct query_info qinfo; 2809 int node_exact; 2810 struct auth_data* node; 2811 struct auth_rrset* nsec; 2812 uint8_t wc[LDNS_MAX_DOMAINLEN]; 2813 if(cenmlen+2 > sizeof(wc)) 2814 return 0; /* result would be too long */ 2815 wc[0] = 1; /* length of wildcard label */ 2816 wc[1] = (uint8_t)'*'; /* wildcard label */ 2817 memmove(wc+2, cenm, cenmlen); 2818 2819 /* we have '*.ce' in wc wildcard name buffer */ 2820 /* get nsec cover for that */ 2821 qinfo.qname = wc; 2822 qinfo.qname_len = cenmlen+2; 2823 qinfo.qtype = 0; 2824 qinfo.qclass = 0; 2825 az_find_domain(z, &qinfo, &node_exact, &node); 2826 if((nsec=az_find_nsec_cover(z, &node)) != NULL) { 2827 if(!msg_add_rrset_ns(z, region, msg, node, nsec)) return 0; 2828 } 2829 return 1; 2830 } 2831 2832 /** Find the NSEC3PARAM rrset (if any) and if true you have the parameters */ 2833 static int 2834 az_nsec3_param(struct auth_zone* z, int* algo, size_t* iter, uint8_t** salt, 2835 size_t* saltlen) 2836 { 2837 struct auth_data* apex; 2838 struct auth_rrset* param; 2839 size_t i; 2840 apex = az_find_name(z, z->name, z->namelen); 2841 if(!apex) return 0; 2842 param = az_domain_rrset(apex, LDNS_RR_TYPE_NSEC3PARAM); 2843 if(!param || param->data->count==0) 2844 return 0; /* no RRset or no RRs in rrset */ 2845 /* find out which NSEC3PARAM RR has supported parameters */ 2846 /* skip unknown flags (dynamic signer is recalculating nsec3 chain) */ 2847 for(i=0; i<param->data->count; i++) { 2848 uint8_t* rdata = param->data->rr_data[i]+2; 2849 size_t rdatalen = param->data->rr_len[i]; 2850 if(rdatalen < 2+5) 2851 continue; /* too short */ 2852 if(!nsec3_hash_algo_size_supported((int)(rdata[0]))) 2853 continue; /* unsupported algo */ 2854 if(rdatalen < (size_t)(2+5+(size_t)rdata[4])) 2855 continue; /* salt missing */ 2856 if((rdata[1]&NSEC3_UNKNOWN_FLAGS)!=0) 2857 continue; /* unknown flags */ 2858 *algo = (int)(rdata[0]); 2859 *iter = sldns_read_uint16(rdata+2); 2860 *saltlen = rdata[4]; 2861 if(*saltlen == 0) 2862 *salt = NULL; 2863 else *salt = rdata+5; 2864 return 1; 2865 } 2866 /* no supported params */ 2867 return 0; 2868 } 2869 2870 /** Hash a name with nsec3param into buffer, it has zone name appended. 2871 * return length of hash */ 2872 static size_t 2873 az_nsec3_hash(uint8_t* buf, size_t buflen, uint8_t* nm, size_t nmlen, 2874 int algo, size_t iter, uint8_t* salt, size_t saltlen) 2875 { 2876 size_t hlen = nsec3_hash_algo_size_supported(algo); 2877 /* buffer has domain name, nsec3hash, and 256 is for max saltlen 2878 * (salt has 0-255 length) */ 2879 unsigned char p[LDNS_MAX_DOMAINLEN+1+N3HASHBUFLEN+256]; 2880 size_t i; 2881 if(nmlen+saltlen > sizeof(p) || hlen+saltlen > sizeof(p)) 2882 return 0; 2883 if(hlen > buflen) 2884 return 0; /* somehow too large for destination buffer */ 2885 /* hashfunc(name, salt) */ 2886 memmove(p, nm, nmlen); 2887 query_dname_tolower(p); 2888 if(salt && saltlen > 0) 2889 memmove(p+nmlen, salt, saltlen); 2890 (void)secalgo_nsec3_hash(algo, p, nmlen+saltlen, (unsigned char*)buf); 2891 for(i=0; i<iter; i++) { 2892 /* hashfunc(hash, salt) */ 2893 memmove(p, buf, hlen); 2894 if(salt && saltlen > 0) 2895 memmove(p+hlen, salt, saltlen); 2896 (void)secalgo_nsec3_hash(algo, p, hlen+saltlen, 2897 (unsigned char*)buf); 2898 } 2899 return hlen; 2900 } 2901 2902 /** Hash name and return b32encoded hashname for lookup, zone name appended */ 2903 static int 2904 az_nsec3_hashname(struct auth_zone* z, uint8_t* hashname, size_t* hashnmlen, 2905 uint8_t* nm, size_t nmlen, int algo, size_t iter, uint8_t* salt, 2906 size_t saltlen) 2907 { 2908 uint8_t hash[N3HASHBUFLEN]; 2909 size_t hlen; 2910 int ret; 2911 hlen = az_nsec3_hash(hash, sizeof(hash), nm, nmlen, algo, iter, 2912 salt, saltlen); 2913 if(!hlen) return 0; 2914 /* b32 encode */ 2915 if(*hashnmlen < hlen*2+1+z->namelen) /* approx b32 as hexb16 */ 2916 return 0; 2917 ret = sldns_b32_ntop_extended_hex(hash, hlen, (char*)(hashname+1), 2918 (*hashnmlen)-1); 2919 if(ret<1) 2920 return 0; 2921 hashname[0] = (uint8_t)ret; 2922 ret++; 2923 if((*hashnmlen) - ret < z->namelen) 2924 return 0; 2925 memmove(hashname+ret, z->name, z->namelen); 2926 *hashnmlen = z->namelen+(size_t)ret; 2927 return 1; 2928 } 2929 2930 /** Find the datanode that covers the nsec3hash-name */ 2931 static struct auth_data* 2932 az_nsec3_findnode(struct auth_zone* z, uint8_t* hashnm, size_t hashnmlen) 2933 { 2934 struct query_info qinfo; 2935 struct auth_data* node; 2936 int node_exact; 2937 qinfo.qclass = 0; 2938 qinfo.qtype = 0; 2939 qinfo.qname = hashnm; 2940 qinfo.qname_len = hashnmlen; 2941 /* because canonical ordering and b32 nsec3 ordering are the same. 2942 * this is a good lookup to find the nsec3 name. */ 2943 az_find_domain(z, &qinfo, &node_exact, &node); 2944 /* but we may have to skip non-nsec3 nodes */ 2945 /* this may be a lot, the way to speed that up is to have a 2946 * separate nsec3 tree with nsec3 nodes */ 2947 while(node && (rbnode_type*)node != RBTREE_NULL && 2948 !az_domain_rrset(node, LDNS_RR_TYPE_NSEC3)) { 2949 node = (struct auth_data*)rbtree_previous(&node->node); 2950 } 2951 if((rbnode_type*)node == RBTREE_NULL) 2952 node = NULL; 2953 return node; 2954 } 2955 2956 /** Find cover for hashed(nm, nmlen) (or NULL) */ 2957 static struct auth_data* 2958 az_nsec3_find_cover(struct auth_zone* z, uint8_t* nm, size_t nmlen, 2959 int algo, size_t iter, uint8_t* salt, size_t saltlen) 2960 { 2961 struct auth_data* node; 2962 uint8_t hname[LDNS_MAX_DOMAINLEN]; 2963 size_t hlen = sizeof(hname); 2964 if(!az_nsec3_hashname(z, hname, &hlen, nm, nmlen, algo, iter, 2965 salt, saltlen)) 2966 return NULL; 2967 node = az_nsec3_findnode(z, hname, hlen); 2968 if(node) 2969 return node; 2970 /* we did not find any, perhaps because the NSEC3 hash is before 2971 * the first hash, we have to find the 'last hash' in the zone */ 2972 node = (struct auth_data*)rbtree_last(&z->data); 2973 while(node && (rbnode_type*)node != RBTREE_NULL && 2974 !az_domain_rrset(node, LDNS_RR_TYPE_NSEC3)) { 2975 node = (struct auth_data*)rbtree_previous(&node->node); 2976 } 2977 if((rbnode_type*)node == RBTREE_NULL) 2978 node = NULL; 2979 return node; 2980 } 2981 2982 /** Find exact match for hashed(nm, nmlen) NSEC3 record or NULL */ 2983 static struct auth_data* 2984 az_nsec3_find_exact(struct auth_zone* z, uint8_t* nm, size_t nmlen, 2985 int algo, size_t iter, uint8_t* salt, size_t saltlen) 2986 { 2987 struct auth_data* node; 2988 uint8_t hname[LDNS_MAX_DOMAINLEN]; 2989 size_t hlen = sizeof(hname); 2990 if(!az_nsec3_hashname(z, hname, &hlen, nm, nmlen, algo, iter, 2991 salt, saltlen)) 2992 return NULL; 2993 node = az_find_name(z, hname, hlen); 2994 if(az_domain_rrset(node, LDNS_RR_TYPE_NSEC3)) 2995 return node; 2996 return NULL; 2997 } 2998 2999 /** Return nextcloser name (as a ref into the qname). This is one label 3000 * more than the cenm (cename must be a suffix of qname) */ 3001 static void 3002 az_nsec3_get_nextcloser(uint8_t* cenm, uint8_t* qname, size_t qname_len, 3003 uint8_t** nx, size_t* nxlen) 3004 { 3005 int celabs = dname_count_labels(cenm); 3006 int qlabs = dname_count_labels(qname); 3007 int strip = qlabs - celabs -1; 3008 log_assert(dname_strict_subdomain(qname, qlabs, cenm, celabs)); 3009 *nx = qname; 3010 *nxlen = qname_len; 3011 if(strip>0) 3012 dname_remove_labels(nx, nxlen, strip); 3013 } 3014 3015 /** Find the closest encloser that has exact NSEC3. 3016 * updated cenm to the new name. If it went up no-exact-ce is true. */ 3017 static struct auth_data* 3018 az_nsec3_find_ce(struct auth_zone* z, uint8_t** cenm, size_t* cenmlen, 3019 int* no_exact_ce, int algo, size_t iter, uint8_t* salt, size_t saltlen) 3020 { 3021 struct auth_data* node; 3022 while((node = az_nsec3_find_exact(z, *cenm, *cenmlen, 3023 algo, iter, salt, saltlen)) == NULL) { 3024 if(*cenmlen == z->namelen) { 3025 /* next step up would take us out of the zone. fail */ 3026 return NULL; 3027 } 3028 *no_exact_ce = 1; 3029 dname_remove_label(cenm, cenmlen); 3030 } 3031 return node; 3032 } 3033 3034 /* Insert NSEC3 record in authority section, if NULL does nothing */ 3035 static int 3036 az_nsec3_insert(struct auth_zone* z, struct regional* region, 3037 struct dns_msg* msg, struct auth_data* node) 3038 { 3039 struct auth_rrset* nsec3; 3040 if(!node) return 1; /* no node, skip this */ 3041 nsec3 = az_domain_rrset(node, LDNS_RR_TYPE_NSEC3); 3042 if(!nsec3) return 1; /* if no nsec3 RR, skip it */ 3043 if(!msg_add_rrset_ns(z, region, msg, node, nsec3)) return 0; 3044 return 1; 3045 } 3046 3047 /** add NSEC3 records to the zone for the nsec3 proof. 3048 * Specify with the flags with parts of the proof are required. 3049 * the ce is the exact matching name (for notype) but also delegation points. 3050 * qname is the one where the nextcloser name can be derived from. 3051 * If NSEC3 is not properly there (in the zone) nothing is added. 3052 * always enabled: include nsec3 proving about the Closest Encloser. 3053 * that is an exact match that should exist for it. 3054 * If that does not exist, a higher exact match + nxproof is enabled 3055 * (for some sort of opt-out empty nonterminal cases). 3056 * nodataproof: search for exact match and include that instead. 3057 * ceproof: include ce proof NSEC3 (omitted for wildcard replies). 3058 * nxproof: include denial of the qname. 3059 * wcproof: include denial of wildcard (wildcard.ce). 3060 */ 3061 static int 3062 az_add_nsec3_proof(struct auth_zone* z, struct regional* region, 3063 struct dns_msg* msg, uint8_t* cenm, size_t cenmlen, uint8_t* qname, 3064 size_t qname_len, int nodataproof, int ceproof, int nxproof, 3065 int wcproof) 3066 { 3067 int algo; 3068 size_t iter, saltlen; 3069 uint8_t* salt; 3070 int no_exact_ce = 0; 3071 struct auth_data* node; 3072 3073 /* find parameters of nsec3 proof */ 3074 if(!az_nsec3_param(z, &algo, &iter, &salt, &saltlen)) 3075 return 1; /* no nsec3 */ 3076 if(nodataproof) { 3077 /* see if the node has a hash of itself for the nodata 3078 * proof nsec3, this has to be an exact match nsec3. */ 3079 struct auth_data* match; 3080 match = az_nsec3_find_exact(z, qname, qname_len, algo, 3081 iter, salt, saltlen); 3082 if(match) { 3083 if(!az_nsec3_insert(z, region, msg, match)) 3084 return 0; 3085 /* only nodata NSEC3 needed, no CE or others. */ 3086 return 1; 3087 } 3088 } 3089 /* find ce that has an NSEC3 */ 3090 if(ceproof) { 3091 node = az_nsec3_find_ce(z, &cenm, &cenmlen, &no_exact_ce, 3092 algo, iter, salt, saltlen); 3093 if(no_exact_ce) nxproof = 1; 3094 if(!az_nsec3_insert(z, region, msg, node)) 3095 return 0; 3096 } 3097 3098 if(nxproof) { 3099 uint8_t* nx; 3100 size_t nxlen; 3101 /* create nextcloser domain name */ 3102 az_nsec3_get_nextcloser(cenm, qname, qname_len, &nx, &nxlen); 3103 /* find nsec3 that matches or covers it */ 3104 node = az_nsec3_find_cover(z, nx, nxlen, algo, iter, salt, 3105 saltlen); 3106 if(!az_nsec3_insert(z, region, msg, node)) 3107 return 0; 3108 } 3109 if(wcproof) { 3110 /* create wildcard name *.ce */ 3111 uint8_t wc[LDNS_MAX_DOMAINLEN]; 3112 size_t wclen; 3113 if(cenmlen+2 > sizeof(wc)) 3114 return 0; /* result would be too long */ 3115 wc[0] = 1; /* length of wildcard label */ 3116 wc[1] = (uint8_t)'*'; /* wildcard label */ 3117 memmove(wc+2, cenm, cenmlen); 3118 wclen = cenmlen+2; 3119 /* find nsec3 that matches or covers it */ 3120 node = az_nsec3_find_cover(z, wc, wclen, algo, iter, salt, 3121 saltlen); 3122 if(!az_nsec3_insert(z, region, msg, node)) 3123 return 0; 3124 } 3125 return 1; 3126 } 3127 3128 /** generate answer for positive answer */ 3129 static int 3130 az_generate_positive_answer(struct auth_zone* z, struct regional* region, 3131 struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset) 3132 { 3133 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0; 3134 /* see if we want additional rrs */ 3135 if(rrset->type == LDNS_RR_TYPE_MX) { 3136 if(!az_add_additionals_from(z, region, msg, rrset, 2)) 3137 return 0; 3138 } else if(rrset->type == LDNS_RR_TYPE_SRV) { 3139 if(!az_add_additionals_from(z, region, msg, rrset, 6)) 3140 return 0; 3141 } else if(rrset->type == LDNS_RR_TYPE_NS) { 3142 if(!az_add_additionals_from(z, region, msg, rrset, 0)) 3143 return 0; 3144 } 3145 return 1; 3146 } 3147 3148 /** generate answer for type ANY answer */ 3149 static int 3150 az_generate_any_answer(struct auth_zone* z, struct regional* region, 3151 struct dns_msg* msg, struct auth_data* node) 3152 { 3153 struct auth_rrset* rrset; 3154 int added = 0; 3155 /* add a couple (at least one) RRs */ 3156 if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_SOA)) != NULL) { 3157 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0; 3158 added++; 3159 } 3160 if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_MX)) != NULL) { 3161 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0; 3162 added++; 3163 } 3164 if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_A)) != NULL) { 3165 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0; 3166 added++; 3167 } 3168 if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_AAAA)) != NULL) { 3169 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0; 3170 added++; 3171 } 3172 if(added == 0 && node && node->rrsets) { 3173 if(!msg_add_rrset_an(z, region, msg, node, 3174 node->rrsets)) return 0; 3175 } 3176 return 1; 3177 } 3178 3179 /** follow cname chain and add more data to the answer section */ 3180 static int 3181 follow_cname_chain(struct auth_zone* z, uint16_t qtype, 3182 struct regional* region, struct dns_msg* msg, 3183 struct packed_rrset_data* d) 3184 { 3185 int maxchain = 0; 3186 /* see if we can add the target of the CNAME into the answer */ 3187 while(maxchain++ < MAX_CNAME_CHAIN) { 3188 struct auth_data* node; 3189 struct auth_rrset* rrset; 3190 size_t clen; 3191 /* d has cname rdata */ 3192 if(d->count == 0) break; /* no CNAME */ 3193 if(d->rr_len[0] < 2+1) break; /* too small */ 3194 if((clen=dname_valid(d->rr_data[0]+2, d->rr_len[0]-2))==0) 3195 break; /* malformed */ 3196 if(!dname_subdomain_c(d->rr_data[0]+2, z->name)) 3197 break; /* target out of zone */ 3198 if((node = az_find_name(z, d->rr_data[0]+2, clen))==NULL) 3199 break; /* no such target name */ 3200 if((rrset=az_domain_rrset(node, qtype))!=NULL) { 3201 /* done we found the target */ 3202 if(!msg_add_rrset_an(z, region, msg, node, rrset)) 3203 return 0; 3204 break; 3205 } 3206 if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_CNAME))==NULL) 3207 break; /* no further CNAME chain, notype */ 3208 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0; 3209 d = rrset->data; 3210 } 3211 return 1; 3212 } 3213 3214 /** generate answer for cname answer */ 3215 static int 3216 az_generate_cname_answer(struct auth_zone* z, struct query_info* qinfo, 3217 struct regional* region, struct dns_msg* msg, 3218 struct auth_data* node, struct auth_rrset* rrset) 3219 { 3220 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0; 3221 if(!rrset) return 1; 3222 if(!follow_cname_chain(z, qinfo->qtype, region, msg, rrset->data)) 3223 return 0; 3224 return 1; 3225 } 3226 3227 /** generate answer for notype answer */ 3228 static int 3229 az_generate_notype_answer(struct auth_zone* z, struct regional* region, 3230 struct dns_msg* msg, struct auth_data* node) 3231 { 3232 struct auth_rrset* rrset; 3233 if(!az_add_negative_soa(z, region, msg)) return 0; 3234 /* DNSSEC denial NSEC */ 3235 if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_NSEC))!=NULL) { 3236 if(!msg_add_rrset_ns(z, region, msg, node, rrset)) return 0; 3237 } else if(node) { 3238 /* DNSSEC denial NSEC3 */ 3239 if(!az_add_nsec3_proof(z, region, msg, node->name, 3240 node->namelen, msg->qinfo.qname, 3241 msg->qinfo.qname_len, 1, 1, 0, 0)) 3242 return 0; 3243 } 3244 return 1; 3245 } 3246 3247 /** generate answer for referral answer */ 3248 static int 3249 az_generate_referral_answer(struct auth_zone* z, struct regional* region, 3250 struct dns_msg* msg, struct auth_data* ce, struct auth_rrset* rrset) 3251 { 3252 struct auth_rrset* ds, *nsec; 3253 /* turn off AA flag, referral is nonAA because it leaves the zone */ 3254 log_assert(ce); 3255 msg->rep->flags &= ~BIT_AA; 3256 if(!msg_add_rrset_ns(z, region, msg, ce, rrset)) return 0; 3257 /* add DS or deny it */ 3258 if((ds=az_domain_rrset(ce, LDNS_RR_TYPE_DS))!=NULL) { 3259 if(!msg_add_rrset_ns(z, region, msg, ce, ds)) return 0; 3260 } else { 3261 /* deny the DS */ 3262 if((nsec=az_domain_rrset(ce, LDNS_RR_TYPE_NSEC))!=NULL) { 3263 if(!msg_add_rrset_ns(z, region, msg, ce, nsec)) 3264 return 0; 3265 } else { 3266 if(!az_add_nsec3_proof(z, region, msg, ce->name, 3267 ce->namelen, msg->qinfo.qname, 3268 msg->qinfo.qname_len, 1, 1, 0, 0)) 3269 return 0; 3270 } 3271 } 3272 /* add additional rrs for type NS */ 3273 if(!az_add_additionals_from(z, region, msg, rrset, 0)) return 0; 3274 return 1; 3275 } 3276 3277 /** generate answer for DNAME answer */ 3278 static int 3279 az_generate_dname_answer(struct auth_zone* z, struct query_info* qinfo, 3280 struct regional* region, struct dns_msg* msg, struct auth_data* ce, 3281 struct auth_rrset* rrset) 3282 { 3283 log_assert(ce); 3284 /* add the DNAME and then a CNAME */ 3285 if(!msg_add_rrset_an(z, region, msg, ce, rrset)) return 0; 3286 if(!add_synth_cname(z, qinfo->qname, qinfo->qname_len, region, 3287 msg, ce, rrset)) return 0; 3288 if(FLAGS_GET_RCODE(msg->rep->flags) == LDNS_RCODE_YXDOMAIN) 3289 return 1; 3290 if(msg->rep->rrset_count == 0 || 3291 !msg->rep->rrsets[msg->rep->rrset_count-1]) 3292 return 0; 3293 if(!follow_cname_chain(z, qinfo->qtype, region, msg, 3294 (struct packed_rrset_data*)msg->rep->rrsets[ 3295 msg->rep->rrset_count-1]->entry.data)) 3296 return 0; 3297 return 1; 3298 } 3299 3300 /** generate answer for wildcard answer */ 3301 static int 3302 az_generate_wildcard_answer(struct auth_zone* z, struct query_info* qinfo, 3303 struct regional* region, struct dns_msg* msg, struct auth_data* ce, 3304 struct auth_data* wildcard, struct auth_data* node) 3305 { 3306 struct auth_rrset* rrset, *nsec; 3307 int insert_ce = 0; 3308 if((rrset=az_domain_rrset(wildcard, qinfo->qtype)) != NULL) { 3309 /* wildcard has type, add it */ 3310 if(!msg_add_rrset_an(z, region, msg, wildcard, rrset)) 3311 return 0; 3312 az_change_dnames(msg, wildcard->name, msg->qinfo.qname, 3313 msg->qinfo.qname_len, 1); 3314 } else if((rrset=az_domain_rrset(wildcard, LDNS_RR_TYPE_CNAME))!=NULL) { 3315 /* wildcard has cname instead, do that */ 3316 if(!msg_add_rrset_an(z, region, msg, wildcard, rrset)) 3317 return 0; 3318 az_change_dnames(msg, wildcard->name, msg->qinfo.qname, 3319 msg->qinfo.qname_len, 1); 3320 if(!follow_cname_chain(z, qinfo->qtype, region, msg, 3321 rrset->data)) 3322 return 0; 3323 } else if(qinfo->qtype == LDNS_RR_TYPE_ANY && wildcard->rrsets) { 3324 /* add ANY rrsets from wildcard node */ 3325 if(!az_generate_any_answer(z, region, msg, wildcard)) 3326 return 0; 3327 az_change_dnames(msg, wildcard->name, msg->qinfo.qname, 3328 msg->qinfo.qname_len, 1); 3329 } else { 3330 /* wildcard has nodata, notype answer */ 3331 /* call other notype routine for dnssec notype denials */ 3332 if(!az_generate_notype_answer(z, region, msg, wildcard)) 3333 return 0; 3334 /* because the notype, there is no positive data with an 3335 * RRSIG that indicates the wildcard position. Thus the 3336 * wildcard qname denial needs to have a CE nsec3. */ 3337 insert_ce = 1; 3338 } 3339 3340 /* ce and node for dnssec denial of wildcard original name */ 3341 if((nsec=az_find_nsec_cover(z, &node)) != NULL) { 3342 if(!msg_add_rrset_ns(z, region, msg, node, nsec)) return 0; 3343 } else if(ce) { 3344 uint8_t* wildup = wildcard->name; 3345 size_t wilduplen= wildcard->namelen; 3346 dname_remove_label(&wildup, &wilduplen); 3347 if(!az_add_nsec3_proof(z, region, msg, wildup, 3348 wilduplen, msg->qinfo.qname, 3349 msg->qinfo.qname_len, 0, insert_ce, 1, 0)) 3350 return 0; 3351 } 3352 3353 /* fixup name of wildcard from *.zone to qname, use already allocated 3354 * pointer to msg qname */ 3355 az_change_dnames(msg, wildcard->name, msg->qinfo.qname, 3356 msg->qinfo.qname_len, 0); 3357 return 1; 3358 } 3359 3360 /** generate answer for nxdomain answer */ 3361 static int 3362 az_generate_nxdomain_answer(struct auth_zone* z, struct regional* region, 3363 struct dns_msg* msg, struct auth_data* ce, struct auth_data* node) 3364 { 3365 struct auth_rrset* nsec; 3366 msg->rep->flags |= LDNS_RCODE_NXDOMAIN; 3367 if(!az_add_negative_soa(z, region, msg)) return 0; 3368 if((nsec=az_find_nsec_cover(z, &node)) != NULL) { 3369 if(!msg_add_rrset_ns(z, region, msg, node, nsec)) return 0; 3370 if(ce && !az_nsec_wildcard_denial(z, region, msg, ce->name, 3371 ce->namelen)) return 0; 3372 } else if(ce) { 3373 if(!az_add_nsec3_proof(z, region, msg, ce->name, 3374 ce->namelen, msg->qinfo.qname, 3375 msg->qinfo.qname_len, 0, 1, 1, 1)) 3376 return 0; 3377 } 3378 return 1; 3379 } 3380 3381 /** Create answers when an exact match exists for the domain name */ 3382 static int 3383 az_generate_answer_with_node(struct auth_zone* z, struct query_info* qinfo, 3384 struct regional* region, struct dns_msg* msg, struct auth_data* node) 3385 { 3386 struct auth_rrset* rrset; 3387 /* positive answer, rrset we are looking for exists */ 3388 if((rrset=az_domain_rrset(node, qinfo->qtype)) != NULL) { 3389 return az_generate_positive_answer(z, region, msg, node, rrset); 3390 } 3391 /* CNAME? */ 3392 if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_CNAME)) != NULL) { 3393 return az_generate_cname_answer(z, qinfo, region, msg, 3394 node, rrset); 3395 } 3396 /* type ANY ? */ 3397 if(qinfo->qtype == LDNS_RR_TYPE_ANY) { 3398 return az_generate_any_answer(z, region, msg, node); 3399 } 3400 /* NOERROR/NODATA (no such type at domain name) */ 3401 return az_generate_notype_answer(z, region, msg, node); 3402 } 3403 3404 /** Generate answer without an existing-node that we can use. 3405 * So it'll be a referral, DNAME or nxdomain */ 3406 static int 3407 az_generate_answer_nonexistnode(struct auth_zone* z, struct query_info* qinfo, 3408 struct regional* region, struct dns_msg* msg, struct auth_data* ce, 3409 struct auth_rrset* rrset, struct auth_data* node) 3410 { 3411 struct auth_data* wildcard; 3412 3413 /* we do not have an exact matching name (that exists) */ 3414 /* see if we have a NS or DNAME in the ce */ 3415 if(ce && rrset && rrset->type == LDNS_RR_TYPE_NS) { 3416 return az_generate_referral_answer(z, region, msg, ce, rrset); 3417 } 3418 if(ce && rrset && rrset->type == LDNS_RR_TYPE_DNAME) { 3419 return az_generate_dname_answer(z, qinfo, region, msg, ce, 3420 rrset); 3421 } 3422 /* if there is an empty nonterminal, wildcard and nxdomain don't 3423 * happen, it is a notype answer */ 3424 if(az_empty_nonterminal(z, qinfo, node)) { 3425 return az_generate_notype_answer(z, region, msg, node); 3426 } 3427 /* see if we have a wildcard under the ce */ 3428 if((wildcard=az_find_wildcard(z, qinfo, ce)) != NULL) { 3429 return az_generate_wildcard_answer(z, qinfo, region, msg, 3430 ce, wildcard, node); 3431 } 3432 /* generate nxdomain answer */ 3433 return az_generate_nxdomain_answer(z, region, msg, ce, node); 3434 } 3435 3436 /** Lookup answer in a zone. */ 3437 static int 3438 auth_zone_generate_answer(struct auth_zone* z, struct query_info* qinfo, 3439 struct regional* region, struct dns_msg** msg, int* fallback) 3440 { 3441 struct auth_data* node, *ce; 3442 struct auth_rrset* rrset; 3443 int node_exact, node_exists; 3444 /* does the zone want fallback in case of failure? */ 3445 *fallback = z->fallback_enabled; 3446 if(!(*msg=msg_create(region, qinfo))) return 0; 3447 3448 /* lookup if there is a matching domain name for the query */ 3449 az_find_domain(z, qinfo, &node_exact, &node); 3450 3451 /* see if node exists for generating answers from (i.e. not glue and 3452 * obscured by NS or DNAME or NSEC3-only), and also return the 3453 * closest-encloser from that, closest node that should be used 3454 * to generate answers from that is above the query */ 3455 node_exists = az_find_ce(z, qinfo, node, node_exact, &ce, &rrset); 3456 3457 if(verbosity >= VERB_ALGO) { 3458 char zname[256], qname[256], nname[256], cename[256], 3459 tpstr[32], rrstr[32]; 3460 sldns_wire2str_dname_buf(qinfo->qname, qinfo->qname_len, qname, 3461 sizeof(qname)); 3462 sldns_wire2str_type_buf(qinfo->qtype, tpstr, sizeof(tpstr)); 3463 sldns_wire2str_dname_buf(z->name, z->namelen, zname, 3464 sizeof(zname)); 3465 if(node) 3466 sldns_wire2str_dname_buf(node->name, node->namelen, 3467 nname, sizeof(nname)); 3468 else snprintf(nname, sizeof(nname), "NULL"); 3469 if(ce) 3470 sldns_wire2str_dname_buf(ce->name, ce->namelen, 3471 cename, sizeof(cename)); 3472 else snprintf(cename, sizeof(cename), "NULL"); 3473 if(rrset) sldns_wire2str_type_buf(rrset->type, rrstr, 3474 sizeof(rrstr)); 3475 else snprintf(rrstr, sizeof(rrstr), "NULL"); 3476 log_info("auth_zone %s query %s %s, domain %s %s %s, " 3477 "ce %s, rrset %s", zname, qname, tpstr, nname, 3478 (node_exact?"exact":"notexact"), 3479 (node_exists?"exist":"notexist"), cename, rrstr); 3480 } 3481 3482 if(node_exists) { 3483 /* the node is fine, generate answer from node */ 3484 return az_generate_answer_with_node(z, qinfo, region, *msg, 3485 node); 3486 } 3487 return az_generate_answer_nonexistnode(z, qinfo, region, *msg, 3488 ce, rrset, node); 3489 } 3490 3491 int auth_zones_lookup(struct auth_zones* az, struct query_info* qinfo, 3492 struct regional* region, struct dns_msg** msg, int* fallback, 3493 uint8_t* dp_nm, size_t dp_nmlen) 3494 { 3495 int r; 3496 struct auth_zone* z; 3497 /* find the zone that should contain the answer. */ 3498 lock_rw_rdlock(&az->lock); 3499 z = auth_zone_find(az, dp_nm, dp_nmlen, qinfo->qclass); 3500 if(!z) { 3501 lock_rw_unlock(&az->lock); 3502 /* no auth zone, fallback to internet */ 3503 *fallback = 1; 3504 return 0; 3505 } 3506 lock_rw_rdlock(&z->lock); 3507 lock_rw_unlock(&az->lock); 3508 3509 /* if not for upstream queries, fallback */ 3510 if(!z->for_upstream) { 3511 lock_rw_unlock(&z->lock); 3512 *fallback = 1; 3513 return 0; 3514 } 3515 if(z->zone_expired) { 3516 *fallback = z->fallback_enabled; 3517 lock_rw_unlock(&z->lock); 3518 return 0; 3519 } 3520 /* see what answer that zone would generate */ 3521 r = auth_zone_generate_answer(z, qinfo, region, msg, fallback); 3522 lock_rw_unlock(&z->lock); 3523 return r; 3524 } 3525 3526 /** encode auth answer */ 3527 static void 3528 auth_answer_encode(struct query_info* qinfo, struct module_env* env, 3529 struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* buf, 3530 struct regional* temp, struct dns_msg* msg) 3531 { 3532 uint16_t udpsize; 3533 udpsize = edns->udp_size; 3534 edns->edns_version = EDNS_ADVERTISED_VERSION; 3535 edns->udp_size = EDNS_ADVERTISED_SIZE; 3536 edns->ext_rcode = 0; 3537 edns->bits &= EDNS_DO; 3538 3539 if(!inplace_cb_reply_local_call(env, qinfo, NULL, msg->rep, 3540 (int)FLAGS_GET_RCODE(msg->rep->flags), edns, repinfo, temp, env->now_tv) 3541 || !reply_info_answer_encode(qinfo, msg->rep, 3542 *(uint16_t*)sldns_buffer_begin(buf), 3543 sldns_buffer_read_u16_at(buf, 2), 3544 buf, 0, 0, temp, udpsize, edns, 3545 (int)(edns->bits&EDNS_DO), 0)) { 3546 error_encode(buf, (LDNS_RCODE_SERVFAIL|BIT_AA), qinfo, 3547 *(uint16_t*)sldns_buffer_begin(buf), 3548 sldns_buffer_read_u16_at(buf, 2), edns); 3549 } 3550 } 3551 3552 /** encode auth error answer */ 3553 static void 3554 auth_error_encode(struct query_info* qinfo, struct module_env* env, 3555 struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* buf, 3556 struct regional* temp, int rcode) 3557 { 3558 edns->edns_version = EDNS_ADVERTISED_VERSION; 3559 edns->udp_size = EDNS_ADVERTISED_SIZE; 3560 edns->ext_rcode = 0; 3561 edns->bits &= EDNS_DO; 3562 3563 if(!inplace_cb_reply_local_call(env, qinfo, NULL, NULL, 3564 rcode, edns, repinfo, temp, env->now_tv)) 3565 edns->opt_list_inplace_cb_out = NULL; 3566 error_encode(buf, rcode|BIT_AA, qinfo, 3567 *(uint16_t*)sldns_buffer_begin(buf), 3568 sldns_buffer_read_u16_at(buf, 2), edns); 3569 } 3570 3571 int auth_zones_answer(struct auth_zones* az, struct module_env* env, 3572 struct query_info* qinfo, struct edns_data* edns, 3573 struct comm_reply* repinfo, struct sldns_buffer* buf, struct regional* temp) 3574 { 3575 struct dns_msg* msg = NULL; 3576 struct auth_zone* z; 3577 int r; 3578 int fallback = 0; 3579 3580 lock_rw_rdlock(&az->lock); 3581 if(!az->have_downstream) { 3582 /* no downstream auth zones */ 3583 lock_rw_unlock(&az->lock); 3584 return 0; 3585 } 3586 if(qinfo->qtype == LDNS_RR_TYPE_DS) { 3587 uint8_t* delname = qinfo->qname; 3588 size_t delnamelen = qinfo->qname_len; 3589 dname_remove_label(&delname, &delnamelen); 3590 z = auth_zones_find_zone(az, delname, delnamelen, 3591 qinfo->qclass); 3592 } else { 3593 z = auth_zones_find_zone(az, qinfo->qname, qinfo->qname_len, 3594 qinfo->qclass); 3595 } 3596 if(!z) { 3597 /* no zone above it */ 3598 lock_rw_unlock(&az->lock); 3599 return 0; 3600 } 3601 lock_rw_rdlock(&z->lock); 3602 lock_rw_unlock(&az->lock); 3603 if(!z->for_downstream) { 3604 lock_rw_unlock(&z->lock); 3605 return 0; 3606 } 3607 if(z->zone_expired) { 3608 if(z->fallback_enabled) { 3609 lock_rw_unlock(&z->lock); 3610 return 0; 3611 } 3612 lock_rw_unlock(&z->lock); 3613 lock_rw_wrlock(&az->lock); 3614 az->num_query_down++; 3615 lock_rw_unlock(&az->lock); 3616 auth_error_encode(qinfo, env, edns, repinfo, buf, temp, 3617 LDNS_RCODE_SERVFAIL); 3618 return 1; 3619 } 3620 3621 /* answer it from zone z */ 3622 r = auth_zone_generate_answer(z, qinfo, temp, &msg, &fallback); 3623 lock_rw_unlock(&z->lock); 3624 if(!r && fallback) { 3625 /* fallback to regular answering (recursive) */ 3626 return 0; 3627 } 3628 lock_rw_wrlock(&az->lock); 3629 az->num_query_down++; 3630 lock_rw_unlock(&az->lock); 3631 3632 /* encode answer */ 3633 if(!r) 3634 auth_error_encode(qinfo, env, edns, repinfo, buf, temp, 3635 LDNS_RCODE_SERVFAIL); 3636 else auth_answer_encode(qinfo, env, edns, repinfo, buf, temp, msg); 3637 3638 return 1; 3639 } 3640 3641 int auth_zones_can_fallback(struct auth_zones* az, uint8_t* nm, size_t nmlen, 3642 uint16_t dclass) 3643 { 3644 int r; 3645 struct auth_zone* z; 3646 lock_rw_rdlock(&az->lock); 3647 z = auth_zone_find(az, nm, nmlen, dclass); 3648 if(!z) { 3649 lock_rw_unlock(&az->lock); 3650 /* no such auth zone, fallback */ 3651 return 1; 3652 } 3653 lock_rw_rdlock(&z->lock); 3654 lock_rw_unlock(&az->lock); 3655 r = z->fallback_enabled || (!z->for_upstream); 3656 lock_rw_unlock(&z->lock); 3657 return r; 3658 } 3659 3660 int 3661 auth_zone_parse_notify_serial(sldns_buffer* pkt, uint32_t *serial) 3662 { 3663 struct query_info q; 3664 uint16_t rdlen; 3665 memset(&q, 0, sizeof(q)); 3666 sldns_buffer_set_position(pkt, 0); 3667 if(!query_info_parse(&q, pkt)) return 0; 3668 if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) == 0) return 0; 3669 /* skip name of RR in answer section */ 3670 if(sldns_buffer_remaining(pkt) < 1) return 0; 3671 if(pkt_dname_len(pkt) == 0) return 0; 3672 /* check type */ 3673 if(sldns_buffer_remaining(pkt) < 10 /* type,class,ttl,rdatalen*/) 3674 return 0; 3675 if(sldns_buffer_read_u16(pkt) != LDNS_RR_TYPE_SOA) return 0; 3676 sldns_buffer_skip(pkt, 2); /* class */ 3677 sldns_buffer_skip(pkt, 4); /* ttl */ 3678 rdlen = sldns_buffer_read_u16(pkt); /* rdatalen */ 3679 if(sldns_buffer_remaining(pkt) < rdlen) return 0; 3680 if(rdlen < 22) return 0; /* bad soa length */ 3681 sldns_buffer_skip(pkt, (ssize_t)(rdlen-20)); 3682 *serial = sldns_buffer_read_u32(pkt); 3683 /* return true when has serial in answer section */ 3684 return 1; 3685 } 3686 3687 /** print addr to str, and if not 53, append "@port_number", for logs. */ 3688 static void addr_port_to_str(struct sockaddr_storage* addr, socklen_t addrlen, 3689 char* buf, size_t len) 3690 { 3691 uint16_t port = 0; 3692 if(addr_is_ip6(addr, addrlen)) { 3693 struct sockaddr_in6* sa = (struct sockaddr_in6*)addr; 3694 port = ntohs((uint16_t)sa->sin6_port); 3695 } else { 3696 struct sockaddr_in* sa = (struct sockaddr_in*)addr; 3697 port = ntohs((uint16_t)sa->sin_port); 3698 } 3699 if(port == UNBOUND_DNS_PORT) { 3700 /* If it is port 53, print it plainly. */ 3701 addr_to_str(addr, addrlen, buf, len); 3702 } else { 3703 char a[256]; 3704 a[0]=0; 3705 addr_to_str(addr, addrlen, a, sizeof(a)); 3706 snprintf(buf, len, "%s@%d", a, (int)port); 3707 } 3708 } 3709 3710 /** see if addr appears in the list */ 3711 static int 3712 addr_in_list(struct auth_addr* list, struct sockaddr_storage* addr, 3713 socklen_t addrlen) 3714 { 3715 struct auth_addr* p; 3716 for(p=list; p; p=p->next) { 3717 if(sockaddr_cmp_addr(addr, addrlen, &p->addr, p->addrlen)==0) 3718 return 1; 3719 } 3720 return 0; 3721 } 3722 3723 /** check if an address matches a master specification (or one of its 3724 * addresses in the addr list) */ 3725 static int 3726 addr_matches_master(struct auth_master* master, struct sockaddr_storage* addr, 3727 socklen_t addrlen, struct auth_master** fromhost) 3728 { 3729 struct sockaddr_storage a; 3730 socklen_t alen = 0; 3731 int net = 0; 3732 if(addr_in_list(master->list, addr, addrlen)) { 3733 *fromhost = master; 3734 return 1; 3735 } 3736 /* compare address (but not port number, that is the destination 3737 * port of the master, the port number of the received notify is 3738 * allowed to by any port on that master) */ 3739 if(extstrtoaddr(master->host, &a, &alen, UNBOUND_DNS_PORT) && 3740 sockaddr_cmp_addr(addr, addrlen, &a, alen)==0) { 3741 *fromhost = master; 3742 return 1; 3743 } 3744 /* prefixes, addr/len, like 10.0.0.0/8 */ 3745 /* not http and has a / and there is one / */ 3746 if(master->allow_notify && !master->http && 3747 strchr(master->host, '/') != NULL && 3748 strchr(master->host, '/') == strrchr(master->host, '/') && 3749 netblockstrtoaddr(master->host, UNBOUND_DNS_PORT, &a, &alen, 3750 &net) && alen == addrlen) { 3751 if(addr_in_common(addr, (addr_is_ip6(addr, addrlen)?128:32), 3752 &a, net, alen) >= net) { 3753 *fromhost = NULL; /* prefix does not have destination 3754 to send the probe or transfer with */ 3755 return 1; /* matches the netblock */ 3756 } 3757 } 3758 return 0; 3759 } 3760 3761 /** check access list for notifies */ 3762 static int 3763 az_xfr_allowed_notify(struct auth_xfer* xfr, struct sockaddr_storage* addr, 3764 socklen_t addrlen, struct auth_master** fromhost) 3765 { 3766 struct auth_master* p; 3767 for(p=xfr->allow_notify_list; p; p=p->next) { 3768 if(addr_matches_master(p, addr, addrlen, fromhost)) { 3769 return 1; 3770 } 3771 } 3772 return 0; 3773 } 3774 3775 /** see if the serial means the zone has to be updated, i.e. the serial 3776 * is newer than the zone serial, or we have no zone */ 3777 static int 3778 xfr_serial_means_update(struct auth_xfer* xfr, uint32_t serial) 3779 { 3780 if(!xfr->have_zone) 3781 return 1; /* no zone, anything is better */ 3782 if(xfr->zone_expired) 3783 return 1; /* expired, the sent serial is better than expired 3784 data */ 3785 if(compare_serial(xfr->serial, serial) < 0) 3786 return 1; /* our serial is smaller than the sent serial, 3787 the data is newer, fetch it */ 3788 return 0; 3789 } 3790 3791 /** note notify serial, updates the notify information in the xfr struct */ 3792 static void 3793 xfr_note_notify_serial(struct auth_xfer* xfr, int has_serial, uint32_t serial) 3794 { 3795 if(xfr->notify_received && xfr->notify_has_serial && has_serial) { 3796 /* see if this serial is newer */ 3797 if(compare_serial(xfr->notify_serial, serial) < 0) 3798 xfr->notify_serial = serial; 3799 } else if(xfr->notify_received && xfr->notify_has_serial && 3800 !has_serial) { 3801 /* remove serial, we have notify without serial */ 3802 xfr->notify_has_serial = 0; 3803 xfr->notify_serial = 0; 3804 } else if(xfr->notify_received && !xfr->notify_has_serial) { 3805 /* we already have notify without serial, keep it 3806 * that way; no serial check when current operation 3807 * is done */ 3808 } else { 3809 xfr->notify_received = 1; 3810 xfr->notify_has_serial = has_serial; 3811 xfr->notify_serial = serial; 3812 } 3813 } 3814 3815 /** process a notify serial, start new probe or note serial. xfr is locked */ 3816 static void 3817 xfr_process_notify(struct auth_xfer* xfr, struct module_env* env, 3818 int has_serial, uint32_t serial, struct auth_master* fromhost) 3819 { 3820 /* if the serial of notify is older than we have, don't fetch 3821 * a zone, we already have it */ 3822 if(has_serial && !xfr_serial_means_update(xfr, serial)) { 3823 lock_basic_unlock(&xfr->lock); 3824 return; 3825 } 3826 /* start new probe with this addr src, or note serial */ 3827 if(!xfr_start_probe(xfr, env, fromhost)) { 3828 /* not started because already in progress, note the serial */ 3829 xfr_note_notify_serial(xfr, has_serial, serial); 3830 lock_basic_unlock(&xfr->lock); 3831 } 3832 /* successful end of start_probe unlocked xfr->lock */ 3833 } 3834 3835 int auth_zones_notify(struct auth_zones* az, struct module_env* env, 3836 uint8_t* nm, size_t nmlen, uint16_t dclass, 3837 struct sockaddr_storage* addr, socklen_t addrlen, int has_serial, 3838 uint32_t serial, int* refused) 3839 { 3840 struct auth_xfer* xfr; 3841 struct auth_master* fromhost = NULL; 3842 /* see which zone this is */ 3843 lock_rw_rdlock(&az->lock); 3844 xfr = auth_xfer_find(az, nm, nmlen, dclass); 3845 if(!xfr) { 3846 lock_rw_unlock(&az->lock); 3847 /* no such zone, refuse the notify */ 3848 *refused = 1; 3849 return 0; 3850 } 3851 lock_basic_lock(&xfr->lock); 3852 lock_rw_unlock(&az->lock); 3853 3854 /* check access list for notifies */ 3855 if(!az_xfr_allowed_notify(xfr, addr, addrlen, &fromhost)) { 3856 lock_basic_unlock(&xfr->lock); 3857 /* notify not allowed, refuse the notify */ 3858 *refused = 1; 3859 return 0; 3860 } 3861 3862 /* process the notify */ 3863 xfr_process_notify(xfr, env, has_serial, serial, fromhost); 3864 return 1; 3865 } 3866 3867 int auth_zones_startprobesequence(struct auth_zones* az, 3868 struct module_env* env, uint8_t* nm, size_t nmlen, uint16_t dclass) 3869 { 3870 struct auth_xfer* xfr; 3871 lock_rw_rdlock(&az->lock); 3872 xfr = auth_xfer_find(az, nm, nmlen, dclass); 3873 if(!xfr) { 3874 lock_rw_unlock(&az->lock); 3875 return 0; 3876 } 3877 lock_basic_lock(&xfr->lock); 3878 lock_rw_unlock(&az->lock); 3879 3880 xfr_process_notify(xfr, env, 0, 0, NULL); 3881 return 1; 3882 } 3883 3884 /** set a zone expired */ 3885 static void 3886 auth_xfer_set_expired(struct auth_xfer* xfr, struct module_env* env, 3887 int expired) 3888 { 3889 struct auth_zone* z; 3890 3891 /* expire xfr */ 3892 lock_basic_lock(&xfr->lock); 3893 xfr->zone_expired = expired; 3894 lock_basic_unlock(&xfr->lock); 3895 3896 /* find auth_zone */ 3897 lock_rw_rdlock(&env->auth_zones->lock); 3898 z = auth_zone_find(env->auth_zones, xfr->name, xfr->namelen, 3899 xfr->dclass); 3900 if(!z) { 3901 lock_rw_unlock(&env->auth_zones->lock); 3902 return; 3903 } 3904 lock_rw_wrlock(&z->lock); 3905 lock_rw_unlock(&env->auth_zones->lock); 3906 3907 /* expire auth_zone */ 3908 z->zone_expired = expired; 3909 lock_rw_unlock(&z->lock); 3910 } 3911 3912 /** find master (from notify or probe) in list of masters */ 3913 static struct auth_master* 3914 find_master_by_host(struct auth_master* list, char* host) 3915 { 3916 struct auth_master* p; 3917 for(p=list; p; p=p->next) { 3918 if(strcmp(p->host, host) == 0) 3919 return p; 3920 } 3921 return NULL; 3922 } 3923 3924 /** delete the looked up auth_addrs for all the masters in the list */ 3925 static void 3926 xfr_masterlist_free_addrs(struct auth_master* list) 3927 { 3928 struct auth_master* m; 3929 for(m=list; m; m=m->next) { 3930 if(m->list) { 3931 auth_free_master_addrs(m->list); 3932 m->list = NULL; 3933 } 3934 } 3935 } 3936 3937 /** copy a list of auth_addrs */ 3938 static struct auth_addr* 3939 auth_addr_list_copy(struct auth_addr* source) 3940 { 3941 struct auth_addr* list = NULL, *last = NULL; 3942 struct auth_addr* p; 3943 for(p=source; p; p=p->next) { 3944 struct auth_addr* a = (struct auth_addr*)memdup(p, sizeof(*p)); 3945 if(!a) { 3946 log_err("malloc failure"); 3947 auth_free_master_addrs(list); 3948 return NULL; 3949 } 3950 a->next = NULL; 3951 if(last) last->next = a; 3952 if(!list) list = a; 3953 last = a; 3954 } 3955 return list; 3956 } 3957 3958 /** copy a master to a new structure, NULL on alloc failure */ 3959 static struct auth_master* 3960 auth_master_copy(struct auth_master* o) 3961 { 3962 struct auth_master* m; 3963 if(!o) return NULL; 3964 m = (struct auth_master*)memdup(o, sizeof(*o)); 3965 if(!m) { 3966 log_err("malloc failure"); 3967 return NULL; 3968 } 3969 m->next = NULL; 3970 if(m->host) { 3971 m->host = strdup(m->host); 3972 if(!m->host) { 3973 free(m); 3974 log_err("malloc failure"); 3975 return NULL; 3976 } 3977 } 3978 if(m->file) { 3979 m->file = strdup(m->file); 3980 if(!m->file) { 3981 free(m->host); 3982 free(m); 3983 log_err("malloc failure"); 3984 return NULL; 3985 } 3986 } 3987 if(m->list) { 3988 m->list = auth_addr_list_copy(m->list); 3989 if(!m->list) { 3990 free(m->file); 3991 free(m->host); 3992 free(m); 3993 return NULL; 3994 } 3995 } 3996 return m; 3997 } 3998 3999 /** copy the master addresses from the task_probe lookups to the allow_notify 4000 * list of masters */ 4001 static void 4002 probe_copy_masters_for_allow_notify(struct auth_xfer* xfr) 4003 { 4004 struct auth_master* list = NULL, *last = NULL; 4005 struct auth_master* p; 4006 /* build up new list with copies */ 4007 for(p = xfr->task_transfer->masters; p; p=p->next) { 4008 struct auth_master* m = auth_master_copy(p); 4009 if(!m) { 4010 auth_free_masters(list); 4011 /* failed because of malloc failure, use old list */ 4012 return; 4013 } 4014 m->next = NULL; 4015 if(last) last->next = m; 4016 if(!list) list = m; 4017 last = m; 4018 } 4019 /* success, replace list */ 4020 auth_free_masters(xfr->allow_notify_list); 4021 xfr->allow_notify_list = list; 4022 } 4023 4024 /** start the lookups for task_transfer */ 4025 static void 4026 xfr_transfer_start_lookups(struct auth_xfer* xfr) 4027 { 4028 /* delete all the looked up addresses in the list */ 4029 xfr->task_transfer->scan_addr = NULL; 4030 xfr_masterlist_free_addrs(xfr->task_transfer->masters); 4031 4032 /* start lookup at the first master */ 4033 xfr->task_transfer->lookup_target = xfr->task_transfer->masters; 4034 xfr->task_transfer->lookup_aaaa = 0; 4035 } 4036 4037 /** move to the next lookup of hostname for task_transfer */ 4038 static void 4039 xfr_transfer_move_to_next_lookup(struct auth_xfer* xfr, struct module_env* env) 4040 { 4041 if(!xfr->task_transfer->lookup_target) 4042 return; /* already at end of list */ 4043 if(!xfr->task_transfer->lookup_aaaa && env->cfg->do_ip6) { 4044 /* move to lookup AAAA */ 4045 xfr->task_transfer->lookup_aaaa = 1; 4046 return; 4047 } 4048 xfr->task_transfer->lookup_target = 4049 xfr->task_transfer->lookup_target->next; 4050 xfr->task_transfer->lookup_aaaa = 0; 4051 if(!env->cfg->do_ip4 && xfr->task_transfer->lookup_target!=NULL) 4052 xfr->task_transfer->lookup_aaaa = 1; 4053 } 4054 4055 /** start the lookups for task_probe */ 4056 static void 4057 xfr_probe_start_lookups(struct auth_xfer* xfr) 4058 { 4059 /* delete all the looked up addresses in the list */ 4060 xfr->task_probe->scan_addr = NULL; 4061 xfr_masterlist_free_addrs(xfr->task_probe->masters); 4062 4063 /* start lookup at the first master */ 4064 xfr->task_probe->lookup_target = xfr->task_probe->masters; 4065 xfr->task_probe->lookup_aaaa = 0; 4066 } 4067 4068 /** move to the next lookup of hostname for task_probe */ 4069 static void 4070 xfr_probe_move_to_next_lookup(struct auth_xfer* xfr, struct module_env* env) 4071 { 4072 if(!xfr->task_probe->lookup_target) 4073 return; /* already at end of list */ 4074 if(!xfr->task_probe->lookup_aaaa && env->cfg->do_ip6) { 4075 /* move to lookup AAAA */ 4076 xfr->task_probe->lookup_aaaa = 1; 4077 return; 4078 } 4079 xfr->task_probe->lookup_target = xfr->task_probe->lookup_target->next; 4080 xfr->task_probe->lookup_aaaa = 0; 4081 if(!env->cfg->do_ip4 && xfr->task_probe->lookup_target!=NULL) 4082 xfr->task_probe->lookup_aaaa = 1; 4083 } 4084 4085 /** start the iteration of the task_transfer list of masters */ 4086 static void 4087 xfr_transfer_start_list(struct auth_xfer* xfr, struct auth_master* spec) 4088 { 4089 if(spec) { 4090 xfr->task_transfer->scan_specific = find_master_by_host( 4091 xfr->task_transfer->masters, spec->host); 4092 if(xfr->task_transfer->scan_specific) { 4093 xfr->task_transfer->scan_target = NULL; 4094 xfr->task_transfer->scan_addr = NULL; 4095 if(xfr->task_transfer->scan_specific->list) 4096 xfr->task_transfer->scan_addr = 4097 xfr->task_transfer->scan_specific->list; 4098 return; 4099 } 4100 } 4101 /* no specific (notified) host to scan */ 4102 xfr->task_transfer->scan_specific = NULL; 4103 xfr->task_transfer->scan_addr = NULL; 4104 /* pick up first scan target */ 4105 xfr->task_transfer->scan_target = xfr->task_transfer->masters; 4106 if(xfr->task_transfer->scan_target && xfr->task_transfer-> 4107 scan_target->list) 4108 xfr->task_transfer->scan_addr = 4109 xfr->task_transfer->scan_target->list; 4110 } 4111 4112 /** start the iteration of the task_probe list of masters */ 4113 static void 4114 xfr_probe_start_list(struct auth_xfer* xfr, struct auth_master* spec) 4115 { 4116 if(spec) { 4117 xfr->task_probe->scan_specific = find_master_by_host( 4118 xfr->task_probe->masters, spec->host); 4119 if(xfr->task_probe->scan_specific) { 4120 xfr->task_probe->scan_target = NULL; 4121 xfr->task_probe->scan_addr = NULL; 4122 if(xfr->task_probe->scan_specific->list) 4123 xfr->task_probe->scan_addr = 4124 xfr->task_probe->scan_specific->list; 4125 return; 4126 } 4127 } 4128 /* no specific (notified) host to scan */ 4129 xfr->task_probe->scan_specific = NULL; 4130 xfr->task_probe->scan_addr = NULL; 4131 /* pick up first scan target */ 4132 xfr->task_probe->scan_target = xfr->task_probe->masters; 4133 if(xfr->task_probe->scan_target && xfr->task_probe->scan_target->list) 4134 xfr->task_probe->scan_addr = 4135 xfr->task_probe->scan_target->list; 4136 } 4137 4138 /** pick up the master that is being scanned right now, task_transfer */ 4139 static struct auth_master* 4140 xfr_transfer_current_master(struct auth_xfer* xfr) 4141 { 4142 if(xfr->task_transfer->scan_specific) 4143 return xfr->task_transfer->scan_specific; 4144 return xfr->task_transfer->scan_target; 4145 } 4146 4147 /** pick up the master that is being scanned right now, task_probe */ 4148 static struct auth_master* 4149 xfr_probe_current_master(struct auth_xfer* xfr) 4150 { 4151 if(xfr->task_probe->scan_specific) 4152 return xfr->task_probe->scan_specific; 4153 return xfr->task_probe->scan_target; 4154 } 4155 4156 /** true if at end of list, task_transfer */ 4157 static int 4158 xfr_transfer_end_of_list(struct auth_xfer* xfr) 4159 { 4160 return !xfr->task_transfer->scan_specific && 4161 !xfr->task_transfer->scan_target; 4162 } 4163 4164 /** true if at end of list, task_probe */ 4165 static int 4166 xfr_probe_end_of_list(struct auth_xfer* xfr) 4167 { 4168 return !xfr->task_probe->scan_specific && !xfr->task_probe->scan_target; 4169 } 4170 4171 /** move to next master in list, task_transfer */ 4172 static void 4173 xfr_transfer_nextmaster(struct auth_xfer* xfr) 4174 { 4175 if(!xfr->task_transfer->scan_specific && 4176 !xfr->task_transfer->scan_target) 4177 return; 4178 if(xfr->task_transfer->scan_addr) { 4179 xfr->task_transfer->scan_addr = 4180 xfr->task_transfer->scan_addr->next; 4181 if(xfr->task_transfer->scan_addr) 4182 return; 4183 } 4184 if(xfr->task_transfer->scan_specific) { 4185 xfr->task_transfer->scan_specific = NULL; 4186 xfr->task_transfer->scan_target = xfr->task_transfer->masters; 4187 if(xfr->task_transfer->scan_target && xfr->task_transfer-> 4188 scan_target->list) 4189 xfr->task_transfer->scan_addr = 4190 xfr->task_transfer->scan_target->list; 4191 return; 4192 } 4193 if(!xfr->task_transfer->scan_target) 4194 return; 4195 xfr->task_transfer->scan_target = xfr->task_transfer->scan_target->next; 4196 if(xfr->task_transfer->scan_target && xfr->task_transfer-> 4197 scan_target->list) 4198 xfr->task_transfer->scan_addr = 4199 xfr->task_transfer->scan_target->list; 4200 return; 4201 } 4202 4203 /** move to next master in list, task_probe */ 4204 static void 4205 xfr_probe_nextmaster(struct auth_xfer* xfr) 4206 { 4207 if(!xfr->task_probe->scan_specific && !xfr->task_probe->scan_target) 4208 return; 4209 if(xfr->task_probe->scan_addr) { 4210 xfr->task_probe->scan_addr = xfr->task_probe->scan_addr->next; 4211 if(xfr->task_probe->scan_addr) 4212 return; 4213 } 4214 if(xfr->task_probe->scan_specific) { 4215 xfr->task_probe->scan_specific = NULL; 4216 xfr->task_probe->scan_target = xfr->task_probe->masters; 4217 if(xfr->task_probe->scan_target && xfr->task_probe-> 4218 scan_target->list) 4219 xfr->task_probe->scan_addr = 4220 xfr->task_probe->scan_target->list; 4221 return; 4222 } 4223 if(!xfr->task_probe->scan_target) 4224 return; 4225 xfr->task_probe->scan_target = xfr->task_probe->scan_target->next; 4226 if(xfr->task_probe->scan_target && xfr->task_probe-> 4227 scan_target->list) 4228 xfr->task_probe->scan_addr = 4229 xfr->task_probe->scan_target->list; 4230 return; 4231 } 4232 4233 /** create SOA probe packet for xfr */ 4234 static void 4235 xfr_create_soa_probe_packet(struct auth_xfer* xfr, sldns_buffer* buf, 4236 uint16_t id) 4237 { 4238 struct query_info qinfo; 4239 4240 memset(&qinfo, 0, sizeof(qinfo)); 4241 qinfo.qname = xfr->name; 4242 qinfo.qname_len = xfr->namelen; 4243 qinfo.qtype = LDNS_RR_TYPE_SOA; 4244 qinfo.qclass = xfr->dclass; 4245 qinfo_query_encode(buf, &qinfo); 4246 sldns_buffer_write_u16_at(buf, 0, id); 4247 } 4248 4249 /** create IXFR/AXFR packet for xfr */ 4250 static void 4251 xfr_create_ixfr_packet(struct auth_xfer* xfr, sldns_buffer* buf, uint16_t id, 4252 struct auth_master* master) 4253 { 4254 struct query_info qinfo; 4255 uint32_t serial; 4256 int have_zone; 4257 have_zone = xfr->have_zone; 4258 serial = xfr->serial; 4259 4260 memset(&qinfo, 0, sizeof(qinfo)); 4261 qinfo.qname = xfr->name; 4262 qinfo.qname_len = xfr->namelen; 4263 xfr->task_transfer->got_xfr_serial = 0; 4264 xfr->task_transfer->rr_scan_num = 0; 4265 xfr->task_transfer->incoming_xfr_serial = 0; 4266 xfr->task_transfer->on_ixfr_is_axfr = 0; 4267 xfr->task_transfer->on_ixfr = 1; 4268 qinfo.qtype = LDNS_RR_TYPE_IXFR; 4269 if(!have_zone || xfr->task_transfer->ixfr_fail || !master->ixfr) { 4270 qinfo.qtype = LDNS_RR_TYPE_AXFR; 4271 xfr->task_transfer->ixfr_fail = 0; 4272 xfr->task_transfer->on_ixfr = 0; 4273 } 4274 4275 qinfo.qclass = xfr->dclass; 4276 qinfo_query_encode(buf, &qinfo); 4277 sldns_buffer_write_u16_at(buf, 0, id); 4278 4279 /* append serial for IXFR */ 4280 if(qinfo.qtype == LDNS_RR_TYPE_IXFR) { 4281 size_t end = sldns_buffer_limit(buf); 4282 sldns_buffer_clear(buf); 4283 sldns_buffer_set_position(buf, end); 4284 /* auth section count 1 */ 4285 sldns_buffer_write_u16_at(buf, LDNS_NSCOUNT_OFF, 1); 4286 /* write SOA */ 4287 sldns_buffer_write_u8(buf, 0xC0); /* compressed ptr to qname */ 4288 sldns_buffer_write_u8(buf, 0x0C); 4289 sldns_buffer_write_u16(buf, LDNS_RR_TYPE_SOA); 4290 sldns_buffer_write_u16(buf, qinfo.qclass); 4291 sldns_buffer_write_u32(buf, 0); /* ttl */ 4292 sldns_buffer_write_u16(buf, 22); /* rdata length */ 4293 sldns_buffer_write_u8(buf, 0); /* . */ 4294 sldns_buffer_write_u8(buf, 0); /* . */ 4295 sldns_buffer_write_u32(buf, serial); /* serial */ 4296 sldns_buffer_write_u32(buf, 0); /* refresh */ 4297 sldns_buffer_write_u32(buf, 0); /* retry */ 4298 sldns_buffer_write_u32(buf, 0); /* expire */ 4299 sldns_buffer_write_u32(buf, 0); /* minimum */ 4300 sldns_buffer_flip(buf); 4301 } 4302 } 4303 4304 /** check if returned packet is OK */ 4305 static int 4306 check_packet_ok(sldns_buffer* pkt, uint16_t qtype, struct auth_xfer* xfr, 4307 uint32_t* serial) 4308 { 4309 /* parse to see if packet worked, valid reply */ 4310 4311 /* check serial number of SOA */ 4312 if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) 4313 return 0; 4314 4315 /* check ID */ 4316 if(LDNS_ID_WIRE(sldns_buffer_begin(pkt)) != xfr->task_probe->id) 4317 return 0; 4318 4319 /* check flag bits and rcode */ 4320 if(!LDNS_QR_WIRE(sldns_buffer_begin(pkt))) 4321 return 0; 4322 if(LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_QUERY) 4323 return 0; 4324 if(LDNS_RCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_RCODE_NOERROR) 4325 return 0; 4326 4327 /* check qname */ 4328 if(LDNS_QDCOUNT(sldns_buffer_begin(pkt)) != 1) 4329 return 0; 4330 sldns_buffer_skip(pkt, LDNS_HEADER_SIZE); 4331 if(sldns_buffer_remaining(pkt) < xfr->namelen) 4332 return 0; 4333 if(query_dname_compare(sldns_buffer_current(pkt), xfr->name) != 0) 4334 return 0; 4335 sldns_buffer_skip(pkt, (ssize_t)xfr->namelen); 4336 4337 /* check qtype, qclass */ 4338 if(sldns_buffer_remaining(pkt) < 4) 4339 return 0; 4340 if(sldns_buffer_read_u16(pkt) != qtype) 4341 return 0; 4342 if(sldns_buffer_read_u16(pkt) != xfr->dclass) 4343 return 0; 4344 4345 if(serial) { 4346 uint16_t rdlen; 4347 /* read serial number, from answer section SOA */ 4348 if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) == 0) 4349 return 0; 4350 /* read from first record SOA record */ 4351 if(sldns_buffer_remaining(pkt) < 1) 4352 return 0; 4353 if(dname_pkt_compare(pkt, sldns_buffer_current(pkt), 4354 xfr->name) != 0) 4355 return 0; 4356 if(!pkt_dname_len(pkt)) 4357 return 0; 4358 /* type, class, ttl, rdatalen */ 4359 if(sldns_buffer_remaining(pkt) < 4+4+2) 4360 return 0; 4361 if(sldns_buffer_read_u16(pkt) != qtype) 4362 return 0; 4363 if(sldns_buffer_read_u16(pkt) != xfr->dclass) 4364 return 0; 4365 sldns_buffer_skip(pkt, 4); /* ttl */ 4366 rdlen = sldns_buffer_read_u16(pkt); 4367 if(sldns_buffer_remaining(pkt) < rdlen) 4368 return 0; 4369 if(sldns_buffer_remaining(pkt) < 1) 4370 return 0; 4371 if(!pkt_dname_len(pkt)) /* soa name */ 4372 return 0; 4373 if(sldns_buffer_remaining(pkt) < 1) 4374 return 0; 4375 if(!pkt_dname_len(pkt)) /* soa name */ 4376 return 0; 4377 if(sldns_buffer_remaining(pkt) < 20) 4378 return 0; 4379 *serial = sldns_buffer_read_u32(pkt); 4380 } 4381 return 1; 4382 } 4383 4384 /** read one line from chunks into buffer at current position */ 4385 static int 4386 chunkline_get_line(struct auth_chunk** chunk, size_t* chunk_pos, 4387 sldns_buffer* buf) 4388 { 4389 int readsome = 0; 4390 while(*chunk) { 4391 /* more text in this chunk? */ 4392 if(*chunk_pos < (*chunk)->len) { 4393 readsome = 1; 4394 while(*chunk_pos < (*chunk)->len) { 4395 char c = (char)((*chunk)->data[*chunk_pos]); 4396 (*chunk_pos)++; 4397 if(sldns_buffer_remaining(buf) < 2) { 4398 /* buffer too short */ 4399 verbose(VERB_ALGO, "http chunkline, " 4400 "line too long"); 4401 return 0; 4402 } 4403 sldns_buffer_write_u8(buf, (uint8_t)c); 4404 if(c == '\n') { 4405 /* we are done */ 4406 return 1; 4407 } 4408 } 4409 } 4410 /* move to next chunk */ 4411 *chunk = (*chunk)->next; 4412 *chunk_pos = 0; 4413 } 4414 /* no more text */ 4415 if(readsome) return 1; 4416 return 0; 4417 } 4418 4419 /** count number of open and closed parenthesis in a chunkline */ 4420 static int 4421 chunkline_count_parens(sldns_buffer* buf, size_t start) 4422 { 4423 size_t end = sldns_buffer_position(buf); 4424 size_t i; 4425 int count = 0; 4426 int squote = 0, dquote = 0; 4427 for(i=start; i<end; i++) { 4428 char c = (char)sldns_buffer_read_u8_at(buf, i); 4429 if(squote && c != '\'') continue; 4430 if(dquote && c != '"') continue; 4431 if(c == '"') 4432 dquote = !dquote; /* skip quoted part */ 4433 else if(c == '\'') 4434 squote = !squote; /* skip quoted part */ 4435 else if(c == '(') 4436 count ++; 4437 else if(c == ')') 4438 count --; 4439 else if(c == ';') { 4440 /* rest is a comment */ 4441 return count; 4442 } 4443 } 4444 return count; 4445 } 4446 4447 /** remove trailing ;... comment from a line in the chunkline buffer */ 4448 static void 4449 chunkline_remove_trailcomment(sldns_buffer* buf, size_t start) 4450 { 4451 size_t end = sldns_buffer_position(buf); 4452 size_t i; 4453 int squote = 0, dquote = 0; 4454 for(i=start; i<end; i++) { 4455 char c = (char)sldns_buffer_read_u8_at(buf, i); 4456 if(squote && c != '\'') continue; 4457 if(dquote && c != '"') continue; 4458 if(c == '"') 4459 dquote = !dquote; /* skip quoted part */ 4460 else if(c == '\'') 4461 squote = !squote; /* skip quoted part */ 4462 else if(c == ';') { 4463 /* rest is a comment */ 4464 sldns_buffer_set_position(buf, i); 4465 return; 4466 } 4467 } 4468 /* nothing to remove */ 4469 } 4470 4471 /** see if a chunkline is a comment line (or empty line) */ 4472 static int 4473 chunkline_is_comment_line_or_empty(sldns_buffer* buf) 4474 { 4475 size_t i, end = sldns_buffer_limit(buf); 4476 for(i=0; i<end; i++) { 4477 char c = (char)sldns_buffer_read_u8_at(buf, i); 4478 if(c == ';') 4479 return 1; /* comment */ 4480 else if(c != ' ' && c != '\t' && c != '\r' && c != '\n') 4481 return 0; /* not a comment */ 4482 } 4483 return 1; /* empty */ 4484 } 4485 4486 /** find a line with ( ) collated */ 4487 static int 4488 chunkline_get_line_collated(struct auth_chunk** chunk, size_t* chunk_pos, 4489 sldns_buffer* buf) 4490 { 4491 size_t pos; 4492 int parens = 0; 4493 sldns_buffer_clear(buf); 4494 pos = sldns_buffer_position(buf); 4495 if(!chunkline_get_line(chunk, chunk_pos, buf)) { 4496 if(sldns_buffer_position(buf) < sldns_buffer_limit(buf)) 4497 sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf), 0); 4498 else sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf)-1, 0); 4499 sldns_buffer_flip(buf); 4500 return 0; 4501 } 4502 parens += chunkline_count_parens(buf, pos); 4503 while(parens > 0) { 4504 chunkline_remove_trailcomment(buf, pos); 4505 pos = sldns_buffer_position(buf); 4506 if(!chunkline_get_line(chunk, chunk_pos, buf)) { 4507 if(sldns_buffer_position(buf) < sldns_buffer_limit(buf)) 4508 sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf), 0); 4509 else sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf)-1, 0); 4510 sldns_buffer_flip(buf); 4511 return 0; 4512 } 4513 parens += chunkline_count_parens(buf, pos); 4514 } 4515 4516 if(sldns_buffer_remaining(buf) < 1) { 4517 verbose(VERB_ALGO, "http chunkline: " 4518 "line too long"); 4519 return 0; 4520 } 4521 sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf), 0); 4522 sldns_buffer_flip(buf); 4523 return 1; 4524 } 4525 4526 /** process $ORIGIN for http, 0 nothing, 1 done, 2 error */ 4527 static int 4528 http_parse_origin(sldns_buffer* buf, struct sldns_file_parse_state* pstate) 4529 { 4530 char* line = (char*)sldns_buffer_begin(buf); 4531 if(strncmp(line, "$ORIGIN", 7) == 0 && 4532 isspace((unsigned char)line[7])) { 4533 int s; 4534 pstate->origin_len = sizeof(pstate->origin); 4535 s = sldns_str2wire_dname_buf(sldns_strip_ws(line+8), 4536 pstate->origin, &pstate->origin_len); 4537 if(s) { 4538 pstate->origin_len = 0; 4539 return 2; 4540 } 4541 return 1; 4542 } 4543 return 0; 4544 } 4545 4546 /** process $TTL for http, 0 nothing, 1 done, 2 error */ 4547 static int 4548 http_parse_ttl(sldns_buffer* buf, struct sldns_file_parse_state* pstate) 4549 { 4550 char* line = (char*)sldns_buffer_begin(buf); 4551 if(strncmp(line, "$TTL", 4) == 0 && 4552 isspace((unsigned char)line[4])) { 4553 const char* end = NULL; 4554 int overflow = 0; 4555 pstate->default_ttl = sldns_str2period( 4556 sldns_strip_ws(line+5), &end, &overflow); 4557 if(overflow) { 4558 return 2; 4559 } 4560 return 1; 4561 } 4562 return 0; 4563 } 4564 4565 /** find noncomment RR line in chunks, collates lines if ( ) format */ 4566 static int 4567 chunkline_non_comment_RR(struct auth_chunk** chunk, size_t* chunk_pos, 4568 sldns_buffer* buf, struct sldns_file_parse_state* pstate) 4569 { 4570 int ret; 4571 while(chunkline_get_line_collated(chunk, chunk_pos, buf)) { 4572 if(chunkline_is_comment_line_or_empty(buf)) { 4573 /* a comment, go to next line */ 4574 continue; 4575 } 4576 if((ret=http_parse_origin(buf, pstate))!=0) { 4577 if(ret == 2) 4578 return 0; 4579 continue; /* $ORIGIN has been handled */ 4580 } 4581 if((ret=http_parse_ttl(buf, pstate))!=0) { 4582 if(ret == 2) 4583 return 0; 4584 continue; /* $TTL has been handled */ 4585 } 4586 return 1; 4587 } 4588 /* no noncomments, fail */ 4589 return 0; 4590 } 4591 4592 /** check syntax of chunklist zonefile, parse first RR, return false on 4593 * failure and return a string in the scratch buffer (first RR string) 4594 * on failure. */ 4595 static int 4596 http_zonefile_syntax_check(struct auth_xfer* xfr, sldns_buffer* buf) 4597 { 4598 uint8_t rr[LDNS_RR_BUF_SIZE]; 4599 size_t rr_len, dname_len = 0; 4600 struct sldns_file_parse_state pstate; 4601 struct auth_chunk* chunk; 4602 size_t chunk_pos; 4603 int e; 4604 memset(&pstate, 0, sizeof(pstate)); 4605 pstate.default_ttl = 3600; 4606 if(xfr->namelen < sizeof(pstate.origin)) { 4607 pstate.origin_len = xfr->namelen; 4608 memmove(pstate.origin, xfr->name, xfr->namelen); 4609 } 4610 chunk = xfr->task_transfer->chunks_first; 4611 chunk_pos = 0; 4612 if(!chunkline_non_comment_RR(&chunk, &chunk_pos, buf, &pstate)) { 4613 return 0; 4614 } 4615 rr_len = sizeof(rr); 4616 e=sldns_str2wire_rr_buf((char*)sldns_buffer_begin(buf), rr, &rr_len, 4617 &dname_len, pstate.default_ttl, 4618 pstate.origin_len?pstate.origin:NULL, pstate.origin_len, 4619 pstate.prev_rr_len?pstate.prev_rr:NULL, pstate.prev_rr_len); 4620 if(e != 0) { 4621 log_err("parse failure on first RR[%d]: %s", 4622 LDNS_WIREPARSE_OFFSET(e), 4623 sldns_get_errorstr_parse(LDNS_WIREPARSE_ERROR(e))); 4624 return 0; 4625 } 4626 /* check that class is correct */ 4627 if(sldns_wirerr_get_class(rr, rr_len, dname_len) != xfr->dclass) { 4628 log_err("parse failure: first record in downloaded zonefile " 4629 "from wrong RR class"); 4630 return 0; 4631 } 4632 return 1; 4633 } 4634 4635 /** sum sizes of chunklist */ 4636 static size_t 4637 chunklist_sum(struct auth_chunk* list) 4638 { 4639 struct auth_chunk* p; 4640 size_t s = 0; 4641 for(p=list; p; p=p->next) { 4642 s += p->len; 4643 } 4644 return s; 4645 } 4646 4647 /** remove newlines from collated line */ 4648 static void 4649 chunkline_newline_removal(sldns_buffer* buf) 4650 { 4651 size_t i, end=sldns_buffer_limit(buf); 4652 for(i=0; i<end; i++) { 4653 char c = (char)sldns_buffer_read_u8_at(buf, i); 4654 if(c == '\n' && i==end-1) { 4655 sldns_buffer_write_u8_at(buf, i, 0); 4656 sldns_buffer_set_limit(buf, end-1); 4657 return; 4658 } 4659 if(c == '\n') 4660 sldns_buffer_write_u8_at(buf, i, (uint8_t)' '); 4661 } 4662 } 4663 4664 /** for http download, parse and add RR to zone */ 4665 static int 4666 http_parse_add_rr(struct auth_xfer* xfr, struct auth_zone* z, 4667 sldns_buffer* buf, struct sldns_file_parse_state* pstate) 4668 { 4669 uint8_t rr[LDNS_RR_BUF_SIZE]; 4670 size_t rr_len, dname_len = 0; 4671 int e; 4672 char* line = (char*)sldns_buffer_begin(buf); 4673 rr_len = sizeof(rr); 4674 e = sldns_str2wire_rr_buf(line, rr, &rr_len, &dname_len, 4675 pstate->default_ttl, 4676 pstate->origin_len?pstate->origin:NULL, pstate->origin_len, 4677 pstate->prev_rr_len?pstate->prev_rr:NULL, pstate->prev_rr_len); 4678 if(e != 0) { 4679 log_err("%s/%s parse failure RR[%d]: %s in '%s'", 4680 xfr->task_transfer->master->host, 4681 xfr->task_transfer->master->file, 4682 LDNS_WIREPARSE_OFFSET(e), 4683 sldns_get_errorstr_parse(LDNS_WIREPARSE_ERROR(e)), 4684 line); 4685 return 0; 4686 } 4687 if(rr_len == 0) 4688 return 1; /* empty line or so */ 4689 4690 /* set prev */ 4691 if(dname_len < sizeof(pstate->prev_rr)) { 4692 memmove(pstate->prev_rr, rr, dname_len); 4693 pstate->prev_rr_len = dname_len; 4694 } 4695 4696 return az_insert_rr(z, rr, rr_len, dname_len, NULL); 4697 } 4698 4699 /** RR list iterator, returns RRs from answer section one by one from the 4700 * dns packets in the chunklist */ 4701 static void 4702 chunk_rrlist_start(struct auth_xfer* xfr, struct auth_chunk** rr_chunk, 4703 int* rr_num, size_t* rr_pos) 4704 { 4705 *rr_chunk = xfr->task_transfer->chunks_first; 4706 *rr_num = 0; 4707 *rr_pos = 0; 4708 } 4709 4710 /** RR list iterator, see if we are at the end of the list */ 4711 static int 4712 chunk_rrlist_end(struct auth_chunk* rr_chunk, int rr_num) 4713 { 4714 while(rr_chunk) { 4715 if(rr_chunk->len < LDNS_HEADER_SIZE) 4716 return 1; 4717 if(rr_num < (int)LDNS_ANCOUNT(rr_chunk->data)) 4718 return 0; 4719 /* no more RRs in this chunk */ 4720 /* continue with next chunk, see if it has RRs */ 4721 rr_chunk = rr_chunk->next; 4722 rr_num = 0; 4723 } 4724 return 1; 4725 } 4726 4727 /** RR list iterator, move to next RR */ 4728 static void 4729 chunk_rrlist_gonext(struct auth_chunk** rr_chunk, int* rr_num, 4730 size_t* rr_pos, size_t rr_nextpos) 4731 { 4732 /* already at end of chunks? */ 4733 if(!*rr_chunk) 4734 return; 4735 /* move within this chunk */ 4736 if((*rr_chunk)->len >= LDNS_HEADER_SIZE && 4737 (*rr_num)+1 < (int)LDNS_ANCOUNT((*rr_chunk)->data)) { 4738 (*rr_num) += 1; 4739 *rr_pos = rr_nextpos; 4740 return; 4741 } 4742 /* no more RRs in this chunk */ 4743 /* continue with next chunk, see if it has RRs */ 4744 if(*rr_chunk) 4745 *rr_chunk = (*rr_chunk)->next; 4746 while(*rr_chunk) { 4747 *rr_num = 0; 4748 *rr_pos = 0; 4749 if((*rr_chunk)->len >= LDNS_HEADER_SIZE && 4750 LDNS_ANCOUNT((*rr_chunk)->data) > 0) { 4751 return; 4752 } 4753 *rr_chunk = (*rr_chunk)->next; 4754 } 4755 } 4756 4757 /** RR iterator, get current RR information, false on parse error */ 4758 static int 4759 chunk_rrlist_get_current(struct auth_chunk* rr_chunk, int rr_num, 4760 size_t rr_pos, uint8_t** rr_dname, uint16_t* rr_type, 4761 uint16_t* rr_class, uint32_t* rr_ttl, uint16_t* rr_rdlen, 4762 uint8_t** rr_rdata, size_t* rr_nextpos) 4763 { 4764 sldns_buffer pkt; 4765 /* integrity checks on position */ 4766 if(!rr_chunk) return 0; 4767 if(rr_chunk->len < LDNS_HEADER_SIZE) return 0; 4768 if(rr_num >= (int)LDNS_ANCOUNT(rr_chunk->data)) return 0; 4769 if(rr_pos >= rr_chunk->len) return 0; 4770 4771 /* fetch rr information */ 4772 sldns_buffer_init_frm_data(&pkt, rr_chunk->data, rr_chunk->len); 4773 if(rr_pos == 0) { 4774 size_t i; 4775 /* skip question section */ 4776 sldns_buffer_set_position(&pkt, LDNS_HEADER_SIZE); 4777 for(i=0; i<LDNS_QDCOUNT(rr_chunk->data); i++) { 4778 if(pkt_dname_len(&pkt) == 0) return 0; 4779 if(sldns_buffer_remaining(&pkt) < 4) return 0; 4780 sldns_buffer_skip(&pkt, 4); /* type and class */ 4781 } 4782 } else { 4783 sldns_buffer_set_position(&pkt, rr_pos); 4784 } 4785 *rr_dname = sldns_buffer_current(&pkt); 4786 if(pkt_dname_len(&pkt) == 0) return 0; 4787 if(sldns_buffer_remaining(&pkt) < 10) return 0; 4788 *rr_type = sldns_buffer_read_u16(&pkt); 4789 *rr_class = sldns_buffer_read_u16(&pkt); 4790 *rr_ttl = sldns_buffer_read_u32(&pkt); 4791 *rr_rdlen = sldns_buffer_read_u16(&pkt); 4792 if(sldns_buffer_remaining(&pkt) < (*rr_rdlen)) return 0; 4793 *rr_rdata = sldns_buffer_current(&pkt); 4794 sldns_buffer_skip(&pkt, (ssize_t)(*rr_rdlen)); 4795 *rr_nextpos = sldns_buffer_position(&pkt); 4796 return 1; 4797 } 4798 4799 /** print log message where we are in parsing the zone transfer */ 4800 static void 4801 log_rrlist_position(const char* label, struct auth_chunk* rr_chunk, 4802 uint8_t* rr_dname, uint16_t rr_type, size_t rr_counter) 4803 { 4804 sldns_buffer pkt; 4805 size_t dlen; 4806 uint8_t buf[256]; 4807 char str[256]; 4808 char typestr[32]; 4809 sldns_buffer_init_frm_data(&pkt, rr_chunk->data, rr_chunk->len); 4810 sldns_buffer_set_position(&pkt, (size_t)(rr_dname - 4811 sldns_buffer_begin(&pkt))); 4812 if((dlen=pkt_dname_len(&pkt)) == 0) return; 4813 if(dlen >= sizeof(buf)) return; 4814 dname_pkt_copy(&pkt, buf, rr_dname); 4815 dname_str(buf, str); 4816 (void)sldns_wire2str_type_buf(rr_type, typestr, sizeof(typestr)); 4817 verbose(VERB_ALGO, "%s at[%d] %s %s", label, (int)rr_counter, 4818 str, typestr); 4819 } 4820 4821 /** check that start serial is OK for ixfr. we are at rr_counter == 0, 4822 * and we are going to check rr_counter == 1 (has to be type SOA) serial */ 4823 static int 4824 ixfr_start_serial(struct auth_chunk* rr_chunk, int rr_num, size_t rr_pos, 4825 uint8_t* rr_dname, uint16_t rr_type, uint16_t rr_class, 4826 uint32_t rr_ttl, uint16_t rr_rdlen, uint8_t* rr_rdata, 4827 size_t rr_nextpos, uint32_t transfer_serial, uint32_t xfr_serial) 4828 { 4829 uint32_t startserial; 4830 /* move forward on RR */ 4831 chunk_rrlist_gonext(&rr_chunk, &rr_num, &rr_pos, rr_nextpos); 4832 if(chunk_rrlist_end(rr_chunk, rr_num)) { 4833 /* no second SOA */ 4834 verbose(VERB_OPS, "IXFR has no second SOA record"); 4835 return 0; 4836 } 4837 if(!chunk_rrlist_get_current(rr_chunk, rr_num, rr_pos, 4838 &rr_dname, &rr_type, &rr_class, &rr_ttl, &rr_rdlen, 4839 &rr_rdata, &rr_nextpos)) { 4840 verbose(VERB_OPS, "IXFR cannot parse second SOA record"); 4841 /* failed to parse RR */ 4842 return 0; 4843 } 4844 if(rr_type != LDNS_RR_TYPE_SOA) { 4845 verbose(VERB_OPS, "IXFR second record is not type SOA"); 4846 return 0; 4847 } 4848 if(rr_rdlen < 22) { 4849 verbose(VERB_OPS, "IXFR, second SOA has short rdlength"); 4850 return 0; /* bad SOA rdlen */ 4851 } 4852 startserial = sldns_read_uint32(rr_rdata+rr_rdlen-20); 4853 if(startserial == transfer_serial) { 4854 /* empty AXFR, not an IXFR */ 4855 verbose(VERB_OPS, "IXFR second serial same as first"); 4856 return 0; 4857 } 4858 if(startserial != xfr_serial) { 4859 /* wrong start serial, it does not match the serial in 4860 * memory */ 4861 verbose(VERB_OPS, "IXFR is from serial %u to %u but %u " 4862 "in memory, rejecting the zone transfer", 4863 (unsigned)startserial, (unsigned)transfer_serial, 4864 (unsigned)xfr_serial); 4865 return 0; 4866 } 4867 /* everything OK in second SOA serial */ 4868 return 1; 4869 } 4870 4871 /** apply IXFR to zone in memory. z is locked. false on failure(mallocfail) */ 4872 static int 4873 apply_ixfr(struct auth_xfer* xfr, struct auth_zone* z, 4874 struct sldns_buffer* scratch_buffer) 4875 { 4876 struct auth_chunk* rr_chunk; 4877 int rr_num; 4878 size_t rr_pos; 4879 uint8_t* rr_dname, *rr_rdata; 4880 uint16_t rr_type, rr_class, rr_rdlen; 4881 uint32_t rr_ttl; 4882 size_t rr_nextpos; 4883 int have_transfer_serial = 0; 4884 uint32_t transfer_serial = 0; 4885 size_t rr_counter = 0; 4886 int delmode = 0; 4887 int softfail = 0; 4888 4889 /* start RR iterator over chunklist of packets */ 4890 chunk_rrlist_start(xfr, &rr_chunk, &rr_num, &rr_pos); 4891 while(!chunk_rrlist_end(rr_chunk, rr_num)) { 4892 if(!chunk_rrlist_get_current(rr_chunk, rr_num, rr_pos, 4893 &rr_dname, &rr_type, &rr_class, &rr_ttl, &rr_rdlen, 4894 &rr_rdata, &rr_nextpos)) { 4895 /* failed to parse RR */ 4896 return 0; 4897 } 4898 if(verbosity>=7) log_rrlist_position("apply ixfr", 4899 rr_chunk, rr_dname, rr_type, rr_counter); 4900 /* twiddle add/del mode and check for start and end */ 4901 if(rr_counter == 0 && rr_type != LDNS_RR_TYPE_SOA) 4902 return 0; 4903 if(rr_counter == 1 && rr_type != LDNS_RR_TYPE_SOA) { 4904 /* this is an AXFR returned from the IXFR master */ 4905 /* but that should already have been detected, by 4906 * on_ixfr_is_axfr */ 4907 return 0; 4908 } 4909 if(rr_type == LDNS_RR_TYPE_SOA) { 4910 uint32_t serial; 4911 if(rr_rdlen < 22) return 0; /* bad SOA rdlen */ 4912 serial = sldns_read_uint32(rr_rdata+rr_rdlen-20); 4913 if(have_transfer_serial == 0) { 4914 have_transfer_serial = 1; 4915 transfer_serial = serial; 4916 delmode = 1; /* gets negated below */ 4917 /* check second RR before going any further */ 4918 if(!ixfr_start_serial(rr_chunk, rr_num, rr_pos, 4919 rr_dname, rr_type, rr_class, rr_ttl, 4920 rr_rdlen, rr_rdata, rr_nextpos, 4921 transfer_serial, xfr->serial)) { 4922 return 0; 4923 } 4924 } else if(transfer_serial == serial) { 4925 have_transfer_serial++; 4926 if(rr_counter == 1) { 4927 /* empty AXFR, with SOA; SOA; */ 4928 /* should have been detected by 4929 * on_ixfr_is_axfr */ 4930 return 0; 4931 } 4932 if(have_transfer_serial == 3) { 4933 /* see serial three times for end */ 4934 /* eg. IXFR: 4935 * SOA 3 start 4936 * SOA 1 second RR, followed by del 4937 * SOA 2 followed by add 4938 * SOA 2 followed by del 4939 * SOA 3 followed by add 4940 * SOA 3 end */ 4941 /* ended by SOA record */ 4942 xfr->serial = transfer_serial; 4943 break; 4944 } 4945 } 4946 /* twiddle add/del mode */ 4947 /* switch from delete part to add part and back again 4948 * just before the soa, it gets deleted and added too 4949 * this means we switch to delete mode for the final 4950 * SOA(so skip that one) */ 4951 delmode = !delmode; 4952 } 4953 /* process this RR */ 4954 /* if the RR is deleted twice or added twice, then we 4955 * softfail, and continue with the rest of the IXFR, so 4956 * that we serve something fairly nice during the refetch */ 4957 if(verbosity>=7) log_rrlist_position((delmode?"del":"add"), 4958 rr_chunk, rr_dname, rr_type, rr_counter); 4959 if(delmode) { 4960 /* delete this RR */ 4961 int nonexist = 0; 4962 if(!az_remove_rr_decompress(z, rr_chunk->data, 4963 rr_chunk->len, scratch_buffer, rr_dname, 4964 rr_type, rr_class, rr_ttl, rr_rdata, rr_rdlen, 4965 &nonexist)) { 4966 /* failed, malloc error or so */ 4967 return 0; 4968 } 4969 if(nonexist) { 4970 /* it was removal of a nonexisting RR */ 4971 if(verbosity>=4) log_rrlist_position( 4972 "IXFR error nonexistent RR", 4973 rr_chunk, rr_dname, rr_type, rr_counter); 4974 softfail = 1; 4975 } 4976 } else if(rr_counter != 0) { 4977 /* skip first SOA RR for addition, it is added in 4978 * the addition part near the end of the ixfr, when 4979 * that serial is seen the second time. */ 4980 int duplicate = 0; 4981 /* add this RR */ 4982 if(!az_insert_rr_decompress(z, rr_chunk->data, 4983 rr_chunk->len, scratch_buffer, rr_dname, 4984 rr_type, rr_class, rr_ttl, rr_rdata, rr_rdlen, 4985 &duplicate)) { 4986 /* failed, malloc error or so */ 4987 return 0; 4988 } 4989 if(duplicate) { 4990 /* it was a duplicate */ 4991 if(verbosity>=4) log_rrlist_position( 4992 "IXFR error duplicate RR", 4993 rr_chunk, rr_dname, rr_type, rr_counter); 4994 softfail = 1; 4995 } 4996 } 4997 4998 rr_counter++; 4999 chunk_rrlist_gonext(&rr_chunk, &rr_num, &rr_pos, rr_nextpos); 5000 } 5001 if(softfail) { 5002 verbose(VERB_ALGO, "IXFR did not apply cleanly, fetching full zone"); 5003 return 0; 5004 } 5005 return 1; 5006 } 5007 5008 /** apply AXFR to zone in memory. z is locked. false on failure(mallocfail) */ 5009 static int 5010 apply_axfr(struct auth_xfer* xfr, struct auth_zone* z, 5011 struct sldns_buffer* scratch_buffer) 5012 { 5013 struct auth_chunk* rr_chunk; 5014 int rr_num; 5015 size_t rr_pos; 5016 uint8_t* rr_dname, *rr_rdata; 5017 uint16_t rr_type, rr_class, rr_rdlen; 5018 uint32_t rr_ttl; 5019 uint32_t serial = 0; 5020 size_t rr_nextpos; 5021 size_t rr_counter = 0; 5022 int have_end_soa = 0; 5023 5024 /* clear the data tree */ 5025 traverse_postorder(&z->data, auth_data_del, NULL); 5026 rbtree_init(&z->data, &auth_data_cmp); 5027 /* clear the RPZ policies */ 5028 if(z->rpz) 5029 rpz_clear(z->rpz); 5030 5031 xfr->have_zone = 0; 5032 xfr->serial = 0; 5033 5034 /* insert all RRs in to the zone */ 5035 /* insert the SOA only once, skip the last one */ 5036 /* start RR iterator over chunklist of packets */ 5037 chunk_rrlist_start(xfr, &rr_chunk, &rr_num, &rr_pos); 5038 while(!chunk_rrlist_end(rr_chunk, rr_num)) { 5039 if(!chunk_rrlist_get_current(rr_chunk, rr_num, rr_pos, 5040 &rr_dname, &rr_type, &rr_class, &rr_ttl, &rr_rdlen, 5041 &rr_rdata, &rr_nextpos)) { 5042 /* failed to parse RR */ 5043 return 0; 5044 } 5045 if(verbosity>=7) log_rrlist_position("apply_axfr", 5046 rr_chunk, rr_dname, rr_type, rr_counter); 5047 if(rr_type == LDNS_RR_TYPE_SOA) { 5048 if(rr_counter != 0) { 5049 /* end of the axfr */ 5050 have_end_soa = 1; 5051 break; 5052 } 5053 if(rr_rdlen < 22) return 0; /* bad SOA rdlen */ 5054 serial = sldns_read_uint32(rr_rdata+rr_rdlen-20); 5055 } 5056 5057 /* add this RR */ 5058 if(!az_insert_rr_decompress(z, rr_chunk->data, rr_chunk->len, 5059 scratch_buffer, rr_dname, rr_type, rr_class, rr_ttl, 5060 rr_rdata, rr_rdlen, NULL)) { 5061 /* failed, malloc error or so */ 5062 return 0; 5063 } 5064 5065 rr_counter++; 5066 chunk_rrlist_gonext(&rr_chunk, &rr_num, &rr_pos, rr_nextpos); 5067 } 5068 if(!have_end_soa) { 5069 log_err("no end SOA record for AXFR"); 5070 return 0; 5071 } 5072 5073 xfr->serial = serial; 5074 xfr->have_zone = 1; 5075 return 1; 5076 } 5077 5078 /** apply HTTP to zone in memory. z is locked. false on failure(mallocfail) */ 5079 static int 5080 apply_http(struct auth_xfer* xfr, struct auth_zone* z, 5081 struct sldns_buffer* scratch_buffer) 5082 { 5083 /* parse data in chunks */ 5084 /* parse RR's and read into memory. ignore $INCLUDE from the 5085 * downloaded file*/ 5086 struct sldns_file_parse_state pstate; 5087 struct auth_chunk* chunk; 5088 size_t chunk_pos; 5089 int ret; 5090 memset(&pstate, 0, sizeof(pstate)); 5091 pstate.default_ttl = 3600; 5092 if(xfr->namelen < sizeof(pstate.origin)) { 5093 pstate.origin_len = xfr->namelen; 5094 memmove(pstate.origin, xfr->name, xfr->namelen); 5095 } 5096 5097 if(verbosity >= VERB_ALGO) 5098 verbose(VERB_ALGO, "http download %s of size %d", 5099 xfr->task_transfer->master->file, 5100 (int)chunklist_sum(xfr->task_transfer->chunks_first)); 5101 if(xfr->task_transfer->chunks_first && verbosity >= VERB_ALGO) { 5102 char preview[1024]; 5103 if(xfr->task_transfer->chunks_first->len+1 > sizeof(preview)) { 5104 memmove(preview, xfr->task_transfer->chunks_first->data, 5105 sizeof(preview)-1); 5106 preview[sizeof(preview)-1]=0; 5107 } else { 5108 memmove(preview, xfr->task_transfer->chunks_first->data, 5109 xfr->task_transfer->chunks_first->len); 5110 preview[xfr->task_transfer->chunks_first->len]=0; 5111 } 5112 log_info("auth zone http downloaded content preview: %s", 5113 preview); 5114 } 5115 5116 /* perhaps a little syntax check before we try to apply the data? */ 5117 if(!http_zonefile_syntax_check(xfr, scratch_buffer)) { 5118 log_err("http download %s/%s does not contain a zonefile, " 5119 "but got '%s'", xfr->task_transfer->master->host, 5120 xfr->task_transfer->master->file, 5121 sldns_buffer_begin(scratch_buffer)); 5122 return 0; 5123 } 5124 5125 /* clear the data tree */ 5126 traverse_postorder(&z->data, auth_data_del, NULL); 5127 rbtree_init(&z->data, &auth_data_cmp); 5128 /* clear the RPZ policies */ 5129 if(z->rpz) 5130 rpz_clear(z->rpz); 5131 5132 xfr->have_zone = 0; 5133 xfr->serial = 0; 5134 5135 chunk = xfr->task_transfer->chunks_first; 5136 chunk_pos = 0; 5137 pstate.lineno = 0; 5138 while(chunkline_get_line_collated(&chunk, &chunk_pos, scratch_buffer)) { 5139 /* process this line */ 5140 pstate.lineno++; 5141 chunkline_newline_removal(scratch_buffer); 5142 if(chunkline_is_comment_line_or_empty(scratch_buffer)) { 5143 continue; 5144 } 5145 /* parse line and add RR */ 5146 if((ret=http_parse_origin(scratch_buffer, &pstate))!=0) { 5147 if(ret == 2) { 5148 verbose(VERB_ALGO, "error parsing ORIGIN on line [%s:%d] %s", 5149 xfr->task_transfer->master->file, 5150 pstate.lineno, 5151 sldns_buffer_begin(scratch_buffer)); 5152 return 0; 5153 } 5154 continue; /* $ORIGIN has been handled */ 5155 } 5156 if((ret=http_parse_ttl(scratch_buffer, &pstate))!=0) { 5157 if(ret == 2) { 5158 verbose(VERB_ALGO, "error parsing TTL on line [%s:%d] %s", 5159 xfr->task_transfer->master->file, 5160 pstate.lineno, 5161 sldns_buffer_begin(scratch_buffer)); 5162 return 0; 5163 } 5164 continue; /* $TTL has been handled */ 5165 } 5166 if(!http_parse_add_rr(xfr, z, scratch_buffer, &pstate)) { 5167 verbose(VERB_ALGO, "error parsing line [%s:%d] %s", 5168 xfr->task_transfer->master->file, 5169 pstate.lineno, 5170 sldns_buffer_begin(scratch_buffer)); 5171 return 0; 5172 } 5173 } 5174 return 1; 5175 } 5176 5177 /** write http chunks to zonefile to create downloaded file */ 5178 static int 5179 auth_zone_write_chunks(struct auth_xfer* xfr, const char* fname) 5180 { 5181 FILE* out; 5182 struct auth_chunk* p; 5183 out = fopen(fname, "w"); 5184 if(!out) { 5185 log_err("could not open %s: %s", fname, strerror(errno)); 5186 return 0; 5187 } 5188 for(p = xfr->task_transfer->chunks_first; p ; p = p->next) { 5189 if(!write_out(out, (char*)p->data, p->len)) { 5190 log_err("could not write http download to %s", fname); 5191 fclose(out); 5192 return 0; 5193 } 5194 } 5195 fclose(out); 5196 return 1; 5197 } 5198 5199 /** write to zonefile after zone has been updated */ 5200 static void 5201 xfr_write_after_update(struct auth_xfer* xfr, struct module_env* env) 5202 { 5203 struct config_file* cfg = env->cfg; 5204 struct auth_zone* z; 5205 char tmpfile[1024]; 5206 char* zfilename; 5207 lock_basic_unlock(&xfr->lock); 5208 5209 /* get lock again, so it is a readlock and concurrently queries 5210 * can be answered */ 5211 lock_rw_rdlock(&env->auth_zones->lock); 5212 z = auth_zone_find(env->auth_zones, xfr->name, xfr->namelen, 5213 xfr->dclass); 5214 if(!z) { 5215 lock_rw_unlock(&env->auth_zones->lock); 5216 /* the zone is gone, ignore xfr results */ 5217 lock_basic_lock(&xfr->lock); 5218 return; 5219 } 5220 lock_rw_rdlock(&z->lock); 5221 lock_basic_lock(&xfr->lock); 5222 lock_rw_unlock(&env->auth_zones->lock); 5223 5224 if(z->zonefile == NULL || z->zonefile[0] == 0) { 5225 lock_rw_unlock(&z->lock); 5226 /* no write needed, no zonefile set */ 5227 return; 5228 } 5229 zfilename = z->zonefile; 5230 if(cfg->chrootdir && cfg->chrootdir[0] && strncmp(zfilename, 5231 cfg->chrootdir, strlen(cfg->chrootdir)) == 0) 5232 zfilename += strlen(cfg->chrootdir); 5233 if(verbosity >= VERB_ALGO) { 5234 char nm[255+1]; 5235 dname_str(z->name, nm); 5236 verbose(VERB_ALGO, "write zonefile %s for %s", zfilename, nm); 5237 } 5238 5239 /* write to tempfile first */ 5240 if((size_t)strlen(zfilename) + 16 > sizeof(tmpfile)) { 5241 verbose(VERB_ALGO, "tmpfilename too long, cannot update " 5242 " zonefile %s", zfilename); 5243 lock_rw_unlock(&z->lock); 5244 return; 5245 } 5246 snprintf(tmpfile, sizeof(tmpfile), "%s.tmp%u", zfilename, 5247 (unsigned)getpid()); 5248 if(xfr->task_transfer->master->http) { 5249 /* use the stored chunk list to write them */ 5250 if(!auth_zone_write_chunks(xfr, tmpfile)) { 5251 unlink(tmpfile); 5252 lock_rw_unlock(&z->lock); 5253 return; 5254 } 5255 } else if(!auth_zone_write_file(z, tmpfile)) { 5256 unlink(tmpfile); 5257 lock_rw_unlock(&z->lock); 5258 return; 5259 } 5260 #ifdef UB_ON_WINDOWS 5261 (void)unlink(zfilename); /* windows does not replace file with rename() */ 5262 #endif 5263 if(rename(tmpfile, zfilename) < 0) { 5264 log_err("could not rename(%s, %s): %s", tmpfile, zfilename, 5265 strerror(errno)); 5266 unlink(tmpfile); 5267 lock_rw_unlock(&z->lock); 5268 return; 5269 } 5270 lock_rw_unlock(&z->lock); 5271 } 5272 5273 /** reacquire locks and structures. Starts with no locks, ends 5274 * with xfr and z locks, if fail, no z lock */ 5275 static int xfr_process_reacquire_locks(struct auth_xfer* xfr, 5276 struct module_env* env, struct auth_zone** z) 5277 { 5278 /* release xfr lock, then, while holding az->lock grab both 5279 * z->lock and xfr->lock */ 5280 lock_rw_rdlock(&env->auth_zones->lock); 5281 *z = auth_zone_find(env->auth_zones, xfr->name, xfr->namelen, 5282 xfr->dclass); 5283 if(!*z) { 5284 lock_rw_unlock(&env->auth_zones->lock); 5285 lock_basic_lock(&xfr->lock); 5286 *z = NULL; 5287 return 0; 5288 } 5289 lock_rw_wrlock(&(*z)->lock); 5290 lock_basic_lock(&xfr->lock); 5291 lock_rw_unlock(&env->auth_zones->lock); 5292 return 1; 5293 } 5294 5295 /** process chunk list and update zone in memory, 5296 * return false if it did not work */ 5297 static int 5298 xfr_process_chunk_list(struct auth_xfer* xfr, struct module_env* env, 5299 int* ixfr_fail) 5300 { 5301 struct auth_zone* z; 5302 5303 /* obtain locks and structures */ 5304 lock_basic_unlock(&xfr->lock); 5305 if(!xfr_process_reacquire_locks(xfr, env, &z)) { 5306 /* the zone is gone, ignore xfr results */ 5307 return 0; 5308 } 5309 /* holding xfr and z locks */ 5310 5311 /* apply data */ 5312 if(xfr->task_transfer->master->http) { 5313 if(!apply_http(xfr, z, env->scratch_buffer)) { 5314 lock_rw_unlock(&z->lock); 5315 verbose(VERB_ALGO, "http from %s: could not store data", 5316 xfr->task_transfer->master->host); 5317 return 0; 5318 } 5319 } else if(xfr->task_transfer->on_ixfr && 5320 !xfr->task_transfer->on_ixfr_is_axfr) { 5321 if(!apply_ixfr(xfr, z, env->scratch_buffer)) { 5322 lock_rw_unlock(&z->lock); 5323 verbose(VERB_ALGO, "xfr from %s: could not store IXFR" 5324 " data", xfr->task_transfer->master->host); 5325 *ixfr_fail = 1; 5326 return 0; 5327 } 5328 } else { 5329 if(!apply_axfr(xfr, z, env->scratch_buffer)) { 5330 lock_rw_unlock(&z->lock); 5331 verbose(VERB_ALGO, "xfr from %s: could not store AXFR" 5332 " data", xfr->task_transfer->master->host); 5333 return 0; 5334 } 5335 } 5336 xfr->zone_expired = 0; 5337 z->zone_expired = 0; 5338 if(!xfr_find_soa(z, xfr)) { 5339 lock_rw_unlock(&z->lock); 5340 verbose(VERB_ALGO, "xfr from %s: no SOA in zone after update" 5341 " (or malformed RR)", xfr->task_transfer->master->host); 5342 return 0; 5343 } 5344 5345 /* release xfr lock while verifying zonemd because it may have 5346 * to spawn lookups in the state machines */ 5347 lock_basic_unlock(&xfr->lock); 5348 /* holding z lock */ 5349 auth_zone_verify_zonemd(z, env, &env->mesh->mods, NULL, 0, 0); 5350 if(z->zone_expired) { 5351 char zname[256]; 5352 /* ZONEMD must have failed */ 5353 /* reacquire locks, so we hold xfr lock on exit of routine, 5354 * and both xfr and z again after releasing xfr for potential 5355 * state machine mesh callbacks */ 5356 lock_rw_unlock(&z->lock); 5357 if(!xfr_process_reacquire_locks(xfr, env, &z)) 5358 return 0; 5359 dname_str(xfr->name, zname); 5360 verbose(VERB_ALGO, "xfr from %s: ZONEMD failed for %s, transfer is failed", xfr->task_transfer->master->host, zname); 5361 xfr->zone_expired = 1; 5362 lock_rw_unlock(&z->lock); 5363 return 0; 5364 } 5365 /* reacquire locks, so we hold xfr lock on exit of routine, 5366 * and both xfr and z again after releasing xfr for potential 5367 * state machine mesh callbacks */ 5368 lock_rw_unlock(&z->lock); 5369 if(!xfr_process_reacquire_locks(xfr, env, &z)) 5370 return 0; 5371 /* holding xfr and z locks */ 5372 5373 if(xfr->have_zone) 5374 xfr->lease_time = *env->now; 5375 5376 if(z->rpz) 5377 rpz_finish_config(z->rpz); 5378 5379 /* unlock */ 5380 lock_rw_unlock(&z->lock); 5381 5382 if(verbosity >= VERB_QUERY && xfr->have_zone) { 5383 char zname[256]; 5384 dname_str(xfr->name, zname); 5385 verbose(VERB_QUERY, "auth zone %s updated to serial %u", zname, 5386 (unsigned)xfr->serial); 5387 } 5388 /* see if we need to write to a zonefile */ 5389 xfr_write_after_update(xfr, env); 5390 return 1; 5391 } 5392 5393 /** disown task_transfer. caller must hold xfr.lock */ 5394 static void 5395 xfr_transfer_disown(struct auth_xfer* xfr) 5396 { 5397 /* remove timer (from this worker's event base) */ 5398 comm_timer_delete(xfr->task_transfer->timer); 5399 xfr->task_transfer->timer = NULL; 5400 /* remove the commpoint */ 5401 comm_point_delete(xfr->task_transfer->cp); 5402 xfr->task_transfer->cp = NULL; 5403 /* we don't own this item anymore */ 5404 xfr->task_transfer->worker = NULL; 5405 xfr->task_transfer->env = NULL; 5406 } 5407 5408 /** lookup a host name for its addresses, if needed */ 5409 static int 5410 xfr_transfer_lookup_host(struct auth_xfer* xfr, struct module_env* env) 5411 { 5412 struct sockaddr_storage addr; 5413 socklen_t addrlen = 0; 5414 struct auth_master* master = xfr->task_transfer->lookup_target; 5415 struct query_info qinfo; 5416 uint16_t qflags = BIT_RD; 5417 uint8_t dname[LDNS_MAX_DOMAINLEN+1]; 5418 struct edns_data edns; 5419 sldns_buffer* buf = env->scratch_buffer; 5420 if(!master) return 0; 5421 if(extstrtoaddr(master->host, &addr, &addrlen, UNBOUND_DNS_PORT)) { 5422 /* not needed, host is in IP addr format */ 5423 return 0; 5424 } 5425 if(master->allow_notify) 5426 return 0; /* allow-notifies are not transferred from, no 5427 lookup is needed */ 5428 5429 /* use mesh_new_callback to probe for non-addr hosts, 5430 * and then wait for them to be looked up (in cache, or query) */ 5431 qinfo.qname_len = sizeof(dname); 5432 if(sldns_str2wire_dname_buf(master->host, dname, &qinfo.qname_len) 5433 != 0) { 5434 log_err("cannot parse host name of master %s", master->host); 5435 return 0; 5436 } 5437 qinfo.qname = dname; 5438 qinfo.qclass = xfr->dclass; 5439 qinfo.qtype = LDNS_RR_TYPE_A; 5440 if(xfr->task_transfer->lookup_aaaa) 5441 qinfo.qtype = LDNS_RR_TYPE_AAAA; 5442 qinfo.local_alias = NULL; 5443 if(verbosity >= VERB_ALGO) { 5444 char buf1[512]; 5445 char buf2[LDNS_MAX_DOMAINLEN+1]; 5446 dname_str(xfr->name, buf2); 5447 snprintf(buf1, sizeof(buf1), "auth zone %s: master lookup" 5448 " for task_transfer", buf2); 5449 log_query_info(VERB_ALGO, buf1, &qinfo); 5450 } 5451 edns.edns_present = 1; 5452 edns.ext_rcode = 0; 5453 edns.edns_version = 0; 5454 edns.bits = EDNS_DO; 5455 edns.opt_list_in = NULL; 5456 edns.opt_list_out = NULL; 5457 edns.opt_list_inplace_cb_out = NULL; 5458 edns.padding_block_size = 0; 5459 edns.cookie_present = 0; 5460 edns.cookie_valid = 0; 5461 if(sldns_buffer_capacity(buf) < 65535) 5462 edns.udp_size = (uint16_t)sldns_buffer_capacity(buf); 5463 else edns.udp_size = 65535; 5464 5465 /* unlock xfr during mesh_new_callback() because the callback can be 5466 * called straight away */ 5467 lock_basic_unlock(&xfr->lock); 5468 if(!mesh_new_callback(env->mesh, &qinfo, qflags, &edns, buf, 0, 5469 &auth_xfer_transfer_lookup_callback, xfr, 0)) { 5470 lock_basic_lock(&xfr->lock); 5471 log_err("out of memory lookup up master %s", master->host); 5472 return 0; 5473 } 5474 lock_basic_lock(&xfr->lock); 5475 return 1; 5476 } 5477 5478 /** initiate TCP to the target and fetch zone. 5479 * returns true if that was successfully started, and timeout setup. */ 5480 static int 5481 xfr_transfer_init_fetch(struct auth_xfer* xfr, struct module_env* env) 5482 { 5483 struct sockaddr_storage addr; 5484 socklen_t addrlen = 0; 5485 struct auth_master* master = xfr->task_transfer->master; 5486 char *auth_name = NULL; 5487 struct timeval t; 5488 int timeout; 5489 if(!master) return 0; 5490 if(master->allow_notify) return 0; /* only for notify */ 5491 5492 /* get master addr */ 5493 if(xfr->task_transfer->scan_addr) { 5494 addrlen = xfr->task_transfer->scan_addr->addrlen; 5495 memmove(&addr, &xfr->task_transfer->scan_addr->addr, addrlen); 5496 } else { 5497 if(!authextstrtoaddr(master->host, &addr, &addrlen, &auth_name)) { 5498 /* the ones that are not in addr format are supposed 5499 * to be looked up. The lookup has failed however, 5500 * so skip them */ 5501 char zname[255+1]; 5502 dname_str(xfr->name, zname); 5503 log_err("%s: failed lookup, cannot transfer from master %s", 5504 zname, master->host); 5505 return 0; 5506 } 5507 } 5508 5509 /* remove previous TCP connection (if any) */ 5510 if(xfr->task_transfer->cp) { 5511 comm_point_delete(xfr->task_transfer->cp); 5512 xfr->task_transfer->cp = NULL; 5513 } 5514 if(!xfr->task_transfer->timer) { 5515 xfr->task_transfer->timer = comm_timer_create(env->worker_base, 5516 auth_xfer_transfer_timer_callback, xfr); 5517 if(!xfr->task_transfer->timer) { 5518 log_err("malloc failure"); 5519 return 0; 5520 } 5521 } 5522 timeout = AUTH_TRANSFER_TIMEOUT; 5523 #ifndef S_SPLINT_S 5524 t.tv_sec = timeout/1000; 5525 t.tv_usec = (timeout%1000)*1000; 5526 #endif 5527 5528 if(master->http) { 5529 /* perform http fetch */ 5530 /* store http port number into sockaddr, 5531 * unless someone used unbound's host@port notation */ 5532 xfr->task_transfer->on_ixfr = 0; 5533 if(strchr(master->host, '@') == NULL) 5534 sockaddr_store_port(&addr, addrlen, master->port); 5535 xfr->task_transfer->cp = outnet_comm_point_for_http( 5536 env->outnet, auth_xfer_transfer_http_callback, xfr, 5537 &addr, addrlen, -1, master->ssl, master->host, 5538 master->file, env->cfg); 5539 if(!xfr->task_transfer->cp) { 5540 char zname[255+1], as[256]; 5541 dname_str(xfr->name, zname); 5542 addr_port_to_str(&addr, addrlen, as, sizeof(as)); 5543 verbose(VERB_ALGO, "cannot create http cp " 5544 "connection for %s to %s", zname, as); 5545 return 0; 5546 } 5547 comm_timer_set(xfr->task_transfer->timer, &t); 5548 if(verbosity >= VERB_ALGO) { 5549 char zname[255+1], as[256]; 5550 dname_str(xfr->name, zname); 5551 addr_port_to_str(&addr, addrlen, as, sizeof(as)); 5552 verbose(VERB_ALGO, "auth zone %s transfer next HTTP fetch from %s started", zname, as); 5553 } 5554 /* Create or refresh the list of allow_notify addrs */ 5555 probe_copy_masters_for_allow_notify(xfr); 5556 return 1; 5557 } 5558 5559 /* perform AXFR/IXFR */ 5560 /* set the packet to be written */ 5561 /* create new ID */ 5562 xfr->task_transfer->id = GET_RANDOM_ID(env->rnd); 5563 xfr_create_ixfr_packet(xfr, env->scratch_buffer, 5564 xfr->task_transfer->id, master); 5565 5566 /* connect on fd */ 5567 xfr->task_transfer->cp = outnet_comm_point_for_tcp(env->outnet, 5568 auth_xfer_transfer_tcp_callback, xfr, &addr, addrlen, 5569 env->scratch_buffer, -1, 5570 auth_name != NULL, auth_name); 5571 if(!xfr->task_transfer->cp) { 5572 char zname[255+1], as[256]; 5573 dname_str(xfr->name, zname); 5574 addr_port_to_str(&addr, addrlen, as, sizeof(as)); 5575 verbose(VERB_ALGO, "cannot create tcp cp connection for " 5576 "xfr %s to %s", zname, as); 5577 return 0; 5578 } 5579 comm_timer_set(xfr->task_transfer->timer, &t); 5580 if(verbosity >= VERB_ALGO) { 5581 char zname[255+1], as[256]; 5582 dname_str(xfr->name, zname); 5583 addr_port_to_str(&addr, addrlen, as, sizeof(as)); 5584 verbose(VERB_ALGO, "auth zone %s transfer next %s fetch from %s started", zname, 5585 (xfr->task_transfer->on_ixfr?"IXFR":"AXFR"), as); 5586 } 5587 return 1; 5588 } 5589 5590 /** perform next lookup, next transfer TCP, or end and resume wait time task */ 5591 static void 5592 xfr_transfer_nexttarget_or_end(struct auth_xfer* xfr, struct module_env* env) 5593 { 5594 log_assert(xfr->task_transfer->worker == env->worker); 5595 5596 /* are we performing lookups? */ 5597 while(xfr->task_transfer->lookup_target) { 5598 if(xfr_transfer_lookup_host(xfr, env)) { 5599 /* wait for lookup to finish, 5600 * note that the hostname may be in unbound's cache 5601 * and we may then get an instant cache response, 5602 * and that calls the callback just like a full 5603 * lookup and lookup failures also call callback */ 5604 if(verbosity >= VERB_ALGO) { 5605 char zname[255+1]; 5606 dname_str(xfr->name, zname); 5607 verbose(VERB_ALGO, "auth zone %s transfer next target lookup", zname); 5608 } 5609 lock_basic_unlock(&xfr->lock); 5610 return; 5611 } 5612 xfr_transfer_move_to_next_lookup(xfr, env); 5613 } 5614 5615 /* initiate TCP and fetch the zone from the master */ 5616 /* and set timeout on it */ 5617 while(!xfr_transfer_end_of_list(xfr)) { 5618 xfr->task_transfer->master = xfr_transfer_current_master(xfr); 5619 if(xfr_transfer_init_fetch(xfr, env)) { 5620 /* successfully started, wait for callback */ 5621 lock_basic_unlock(&xfr->lock); 5622 return; 5623 } 5624 /* failed to fetch, next master */ 5625 xfr_transfer_nextmaster(xfr); 5626 } 5627 if(verbosity >= VERB_ALGO) { 5628 char zname[255+1]; 5629 dname_str(xfr->name, zname); 5630 verbose(VERB_ALGO, "auth zone %s transfer failed, wait", zname); 5631 } 5632 5633 /* we failed to fetch the zone, move to wait task 5634 * use the shorter retry timeout */ 5635 xfr_transfer_disown(xfr); 5636 5637 /* pick up the nextprobe task and wait */ 5638 if(xfr->task_nextprobe->worker == NULL) 5639 xfr_set_timeout(xfr, env, 1, 0); 5640 lock_basic_unlock(&xfr->lock); 5641 } 5642 5643 /** add addrs from A or AAAA rrset to the master */ 5644 static void 5645 xfr_master_add_addrs(struct auth_master* m, struct ub_packed_rrset_key* rrset, 5646 uint16_t rrtype) 5647 { 5648 size_t i; 5649 struct packed_rrset_data* data; 5650 if(!m || !rrset) return; 5651 if(rrtype != LDNS_RR_TYPE_A && rrtype != LDNS_RR_TYPE_AAAA) 5652 return; 5653 data = (struct packed_rrset_data*)rrset->entry.data; 5654 for(i=0; i<data->count; i++) { 5655 struct auth_addr* a; 5656 size_t len = data->rr_len[i] - 2; 5657 uint8_t* rdata = data->rr_data[i]+2; 5658 if(rrtype == LDNS_RR_TYPE_A && len != INET_SIZE) 5659 continue; /* wrong length for A */ 5660 if(rrtype == LDNS_RR_TYPE_AAAA && len != INET6_SIZE) 5661 continue; /* wrong length for AAAA */ 5662 5663 /* add and alloc it */ 5664 a = (struct auth_addr*)calloc(1, sizeof(*a)); 5665 if(!a) { 5666 log_err("out of memory"); 5667 return; 5668 } 5669 if(rrtype == LDNS_RR_TYPE_A) { 5670 struct sockaddr_in* sa; 5671 a->addrlen = (socklen_t)sizeof(*sa); 5672 sa = (struct sockaddr_in*)&a->addr; 5673 sa->sin_family = AF_INET; 5674 sa->sin_port = (in_port_t)htons(UNBOUND_DNS_PORT); 5675 memmove(&sa->sin_addr, rdata, INET_SIZE); 5676 } else { 5677 struct sockaddr_in6* sa; 5678 a->addrlen = (socklen_t)sizeof(*sa); 5679 sa = (struct sockaddr_in6*)&a->addr; 5680 sa->sin6_family = AF_INET6; 5681 sa->sin6_port = (in_port_t)htons(UNBOUND_DNS_PORT); 5682 memmove(&sa->sin6_addr, rdata, INET6_SIZE); 5683 } 5684 if(verbosity >= VERB_ALGO) { 5685 char s[64]; 5686 addr_port_to_str(&a->addr, a->addrlen, s, sizeof(s)); 5687 verbose(VERB_ALGO, "auth host %s lookup %s", 5688 m->host, s); 5689 } 5690 /* append to list */ 5691 a->next = m->list; 5692 m->list = a; 5693 } 5694 } 5695 5696 /** callback for task_transfer lookup of host name, of A or AAAA */ 5697 void auth_xfer_transfer_lookup_callback(void* arg, int rcode, sldns_buffer* buf, 5698 enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus), 5699 int ATTR_UNUSED(was_ratelimited)) 5700 { 5701 struct auth_xfer* xfr = (struct auth_xfer*)arg; 5702 struct module_env* env; 5703 log_assert(xfr->task_transfer); 5704 lock_basic_lock(&xfr->lock); 5705 env = xfr->task_transfer->env; 5706 if(!env || env->outnet->want_to_quit) { 5707 lock_basic_unlock(&xfr->lock); 5708 return; /* stop on quit */ 5709 } 5710 5711 /* process result */ 5712 if(rcode == LDNS_RCODE_NOERROR) { 5713 uint16_t wanted_qtype = LDNS_RR_TYPE_A; 5714 struct regional* temp = env->scratch; 5715 struct query_info rq; 5716 struct reply_info* rep; 5717 if(xfr->task_transfer->lookup_aaaa) 5718 wanted_qtype = LDNS_RR_TYPE_AAAA; 5719 memset(&rq, 0, sizeof(rq)); 5720 rep = parse_reply_in_temp_region(buf, temp, &rq); 5721 if(rep && rq.qtype == wanted_qtype && 5722 FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NOERROR) { 5723 /* parsed successfully */ 5724 struct ub_packed_rrset_key* answer = 5725 reply_find_answer_rrset(&rq, rep); 5726 if(answer) { 5727 xfr_master_add_addrs(xfr->task_transfer-> 5728 lookup_target, answer, wanted_qtype); 5729 } else { 5730 if(verbosity >= VERB_ALGO) { 5731 char zname[255+1]; 5732 dname_str(xfr->name, zname); 5733 verbose(VERB_ALGO, "auth zone %s host %s type %s transfer lookup has nodata", zname, xfr->task_transfer->lookup_target->host, (xfr->task_transfer->lookup_aaaa?"AAAA":"A")); 5734 } 5735 } 5736 } else { 5737 if(verbosity >= VERB_ALGO) { 5738 char zname[255+1]; 5739 dname_str(xfr->name, zname); 5740 verbose(VERB_ALGO, "auth zone %s host %s type %s transfer lookup has no answer", zname, xfr->task_transfer->lookup_target->host, (xfr->task_transfer->lookup_aaaa?"AAAA":"A")); 5741 } 5742 } 5743 regional_free_all(temp); 5744 } else { 5745 if(verbosity >= VERB_ALGO) { 5746 char zname[255+1]; 5747 dname_str(xfr->name, zname); 5748 verbose(VERB_ALGO, "auth zone %s host %s type %s transfer lookup failed", zname, xfr->task_transfer->lookup_target->host, (xfr->task_transfer->lookup_aaaa?"AAAA":"A")); 5749 } 5750 } 5751 if(xfr->task_transfer->lookup_target->list && 5752 xfr->task_transfer->lookup_target == xfr_transfer_current_master(xfr)) 5753 xfr->task_transfer->scan_addr = xfr->task_transfer->lookup_target->list; 5754 5755 /* move to lookup AAAA after A lookup, move to next hostname lookup, 5756 * or move to fetch the zone, or, if nothing to do, end task_transfer */ 5757 xfr_transfer_move_to_next_lookup(xfr, env); 5758 xfr_transfer_nexttarget_or_end(xfr, env); 5759 } 5760 5761 /** check if xfer (AXFR or IXFR) packet is OK. 5762 * return false if we lost connection (SERVFAIL, or unreadable). 5763 * return false if we need to move from IXFR to AXFR, with gonextonfail 5764 * set to false, so the same master is tried again, but with AXFR. 5765 * return true if fine to link into data. 5766 * return true with transferdone=true when the transfer has ended. 5767 */ 5768 static int 5769 check_xfer_packet(sldns_buffer* pkt, struct auth_xfer* xfr, 5770 int* gonextonfail, int* transferdone) 5771 { 5772 uint8_t* wire = sldns_buffer_begin(pkt); 5773 int i; 5774 if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) { 5775 verbose(VERB_ALGO, "xfr to %s failed, packet too small", 5776 xfr->task_transfer->master->host); 5777 return 0; 5778 } 5779 if(!LDNS_QR_WIRE(wire)) { 5780 verbose(VERB_ALGO, "xfr to %s failed, packet has no QR flag", 5781 xfr->task_transfer->master->host); 5782 return 0; 5783 } 5784 if(LDNS_TC_WIRE(wire)) { 5785 verbose(VERB_ALGO, "xfr to %s failed, packet has TC flag", 5786 xfr->task_transfer->master->host); 5787 return 0; 5788 } 5789 /* check ID */ 5790 if(LDNS_ID_WIRE(wire) != xfr->task_transfer->id) { 5791 verbose(VERB_ALGO, "xfr to %s failed, packet wrong ID", 5792 xfr->task_transfer->master->host); 5793 return 0; 5794 } 5795 if(LDNS_RCODE_WIRE(wire) != LDNS_RCODE_NOERROR) { 5796 char rcode[32]; 5797 sldns_wire2str_rcode_buf((int)LDNS_RCODE_WIRE(wire), rcode, 5798 sizeof(rcode)); 5799 /* if we are doing IXFR, check for fallback */ 5800 if(xfr->task_transfer->on_ixfr) { 5801 if(LDNS_RCODE_WIRE(wire) == LDNS_RCODE_NOTIMPL || 5802 LDNS_RCODE_WIRE(wire) == LDNS_RCODE_SERVFAIL || 5803 LDNS_RCODE_WIRE(wire) == LDNS_RCODE_REFUSED || 5804 LDNS_RCODE_WIRE(wire) == LDNS_RCODE_FORMERR) { 5805 verbose(VERB_ALGO, "xfr to %s, fallback " 5806 "from IXFR to AXFR (with rcode %s)", 5807 xfr->task_transfer->master->host, 5808 rcode); 5809 xfr->task_transfer->ixfr_fail = 1; 5810 *gonextonfail = 0; 5811 return 0; 5812 } 5813 } 5814 verbose(VERB_ALGO, "xfr to %s failed, packet with rcode %s", 5815 xfr->task_transfer->master->host, rcode); 5816 return 0; 5817 } 5818 if(LDNS_OPCODE_WIRE(wire) != LDNS_PACKET_QUERY) { 5819 verbose(VERB_ALGO, "xfr to %s failed, packet with bad opcode", 5820 xfr->task_transfer->master->host); 5821 return 0; 5822 } 5823 if(LDNS_QDCOUNT(wire) > 1) { 5824 verbose(VERB_ALGO, "xfr to %s failed, packet has qdcount %d", 5825 xfr->task_transfer->master->host, 5826 (int)LDNS_QDCOUNT(wire)); 5827 return 0; 5828 } 5829 5830 /* check qname */ 5831 sldns_buffer_set_position(pkt, LDNS_HEADER_SIZE); 5832 for(i=0; i<(int)LDNS_QDCOUNT(wire); i++) { 5833 size_t pos = sldns_buffer_position(pkt); 5834 uint16_t qtype, qclass; 5835 if(pkt_dname_len(pkt) == 0) { 5836 verbose(VERB_ALGO, "xfr to %s failed, packet with " 5837 "malformed dname", 5838 xfr->task_transfer->master->host); 5839 return 0; 5840 } 5841 if(dname_pkt_compare(pkt, sldns_buffer_at(pkt, pos), 5842 xfr->name) != 0) { 5843 verbose(VERB_ALGO, "xfr to %s failed, packet with " 5844 "wrong qname", 5845 xfr->task_transfer->master->host); 5846 return 0; 5847 } 5848 if(sldns_buffer_remaining(pkt) < 4) { 5849 verbose(VERB_ALGO, "xfr to %s failed, packet with " 5850 "truncated query RR", 5851 xfr->task_transfer->master->host); 5852 return 0; 5853 } 5854 qtype = sldns_buffer_read_u16(pkt); 5855 qclass = sldns_buffer_read_u16(pkt); 5856 if(qclass != xfr->dclass) { 5857 verbose(VERB_ALGO, "xfr to %s failed, packet with " 5858 "wrong qclass", 5859 xfr->task_transfer->master->host); 5860 return 0; 5861 } 5862 if(xfr->task_transfer->on_ixfr) { 5863 if(qtype != LDNS_RR_TYPE_IXFR) { 5864 verbose(VERB_ALGO, "xfr to %s failed, packet " 5865 "with wrong qtype, expected IXFR", 5866 xfr->task_transfer->master->host); 5867 return 0; 5868 } 5869 } else { 5870 if(qtype != LDNS_RR_TYPE_AXFR) { 5871 verbose(VERB_ALGO, "xfr to %s failed, packet " 5872 "with wrong qtype, expected AXFR", 5873 xfr->task_transfer->master->host); 5874 return 0; 5875 } 5876 } 5877 } 5878 5879 /* check parse of RRs in packet, store first SOA serial 5880 * to be able to detect last SOA (with that serial) to see if done */ 5881 /* also check for IXFR 'zone up to date' reply */ 5882 for(i=0; i<(int)LDNS_ANCOUNT(wire); i++) { 5883 size_t pos = sldns_buffer_position(pkt); 5884 uint16_t tp, rdlen; 5885 if(pkt_dname_len(pkt) == 0) { 5886 verbose(VERB_ALGO, "xfr to %s failed, packet with " 5887 "malformed dname in answer section", 5888 xfr->task_transfer->master->host); 5889 return 0; 5890 } 5891 if(sldns_buffer_remaining(pkt) < 10) { 5892 verbose(VERB_ALGO, "xfr to %s failed, packet with " 5893 "truncated RR", 5894 xfr->task_transfer->master->host); 5895 return 0; 5896 } 5897 tp = sldns_buffer_read_u16(pkt); 5898 (void)sldns_buffer_read_u16(pkt); /* class */ 5899 (void)sldns_buffer_read_u32(pkt); /* ttl */ 5900 rdlen = sldns_buffer_read_u16(pkt); 5901 if(sldns_buffer_remaining(pkt) < rdlen) { 5902 verbose(VERB_ALGO, "xfr to %s failed, packet with " 5903 "truncated RR rdata", 5904 xfr->task_transfer->master->host); 5905 return 0; 5906 } 5907 5908 /* RR parses (haven't checked rdata itself), now look at 5909 * SOA records to see serial number */ 5910 if(xfr->task_transfer->rr_scan_num == 0 && 5911 tp != LDNS_RR_TYPE_SOA) { 5912 verbose(VERB_ALGO, "xfr to %s failed, packet with " 5913 "malformed zone transfer, no start SOA", 5914 xfr->task_transfer->master->host); 5915 return 0; 5916 } 5917 if(xfr->task_transfer->rr_scan_num == 1 && 5918 tp != LDNS_RR_TYPE_SOA) { 5919 /* second RR is not a SOA record, this is not an IXFR 5920 * the master is replying with an AXFR */ 5921 xfr->task_transfer->on_ixfr_is_axfr = 1; 5922 } 5923 if(tp == LDNS_RR_TYPE_SOA) { 5924 uint32_t serial; 5925 if(rdlen < 22) { 5926 verbose(VERB_ALGO, "xfr to %s failed, packet " 5927 "with SOA with malformed rdata", 5928 xfr->task_transfer->master->host); 5929 return 0; 5930 } 5931 if(dname_pkt_compare(pkt, sldns_buffer_at(pkt, pos), 5932 xfr->name) != 0) { 5933 verbose(VERB_ALGO, "xfr to %s failed, packet " 5934 "with SOA with wrong dname", 5935 xfr->task_transfer->master->host); 5936 return 0; 5937 } 5938 5939 /* read serial number of SOA */ 5940 serial = sldns_buffer_read_u32_at(pkt, 5941 sldns_buffer_position(pkt)+rdlen-20); 5942 5943 /* check for IXFR 'zone has SOA x' reply */ 5944 if(xfr->task_transfer->on_ixfr && 5945 xfr->task_transfer->rr_scan_num == 0 && 5946 LDNS_ANCOUNT(wire)==1) { 5947 verbose(VERB_ALGO, "xfr to %s ended, " 5948 "IXFR reply that zone has serial %u," 5949 " fallback from IXFR to AXFR", 5950 xfr->task_transfer->master->host, 5951 (unsigned)serial); 5952 xfr->task_transfer->ixfr_fail = 1; 5953 *gonextonfail = 0; 5954 return 0; 5955 } 5956 5957 /* if first SOA, store serial number */ 5958 if(xfr->task_transfer->got_xfr_serial == 0) { 5959 xfr->task_transfer->got_xfr_serial = 1; 5960 xfr->task_transfer->incoming_xfr_serial = 5961 serial; 5962 verbose(VERB_ALGO, "xfr %s: contains " 5963 "SOA serial %u", 5964 xfr->task_transfer->master->host, 5965 (unsigned)serial); 5966 /* see if end of AXFR */ 5967 } else if(!xfr->task_transfer->on_ixfr || 5968 xfr->task_transfer->on_ixfr_is_axfr) { 5969 /* second SOA with serial is the end 5970 * for AXFR */ 5971 *transferdone = 1; 5972 verbose(VERB_ALGO, "xfr %s: last AXFR packet", 5973 xfr->task_transfer->master->host); 5974 /* for IXFR, count SOA records with that serial */ 5975 } else if(xfr->task_transfer->incoming_xfr_serial == 5976 serial && xfr->task_transfer->got_xfr_serial 5977 == 1) { 5978 xfr->task_transfer->got_xfr_serial++; 5979 /* if not first soa, if serial==firstserial, the 5980 * third time we are at the end, for IXFR */ 5981 } else if(xfr->task_transfer->incoming_xfr_serial == 5982 serial && xfr->task_transfer->got_xfr_serial 5983 == 2) { 5984 verbose(VERB_ALGO, "xfr %s: last IXFR packet", 5985 xfr->task_transfer->master->host); 5986 *transferdone = 1; 5987 /* continue parse check, if that succeeds, 5988 * transfer is done */ 5989 } 5990 } 5991 xfr->task_transfer->rr_scan_num++; 5992 5993 /* skip over RR rdata to go to the next RR */ 5994 sldns_buffer_skip(pkt, (ssize_t)rdlen); 5995 } 5996 5997 /* check authority section */ 5998 /* we skip over the RRs checking packet format */ 5999 for(i=0; i<(int)LDNS_NSCOUNT(wire); i++) { 6000 uint16_t rdlen; 6001 if(pkt_dname_len(pkt) == 0) { 6002 verbose(VERB_ALGO, "xfr to %s failed, packet with " 6003 "malformed dname in authority section", 6004 xfr->task_transfer->master->host); 6005 return 0; 6006 } 6007 if(sldns_buffer_remaining(pkt) < 10) { 6008 verbose(VERB_ALGO, "xfr to %s failed, packet with " 6009 "truncated RR", 6010 xfr->task_transfer->master->host); 6011 return 0; 6012 } 6013 (void)sldns_buffer_read_u16(pkt); /* type */ 6014 (void)sldns_buffer_read_u16(pkt); /* class */ 6015 (void)sldns_buffer_read_u32(pkt); /* ttl */ 6016 rdlen = sldns_buffer_read_u16(pkt); 6017 if(sldns_buffer_remaining(pkt) < rdlen) { 6018 verbose(VERB_ALGO, "xfr to %s failed, packet with " 6019 "truncated RR rdata", 6020 xfr->task_transfer->master->host); 6021 return 0; 6022 } 6023 /* skip over RR rdata to go to the next RR */ 6024 sldns_buffer_skip(pkt, (ssize_t)rdlen); 6025 } 6026 6027 /* check additional section */ 6028 for(i=0; i<(int)LDNS_ARCOUNT(wire); i++) { 6029 uint16_t rdlen; 6030 if(pkt_dname_len(pkt) == 0) { 6031 verbose(VERB_ALGO, "xfr to %s failed, packet with " 6032 "malformed dname in additional section", 6033 xfr->task_transfer->master->host); 6034 return 0; 6035 } 6036 if(sldns_buffer_remaining(pkt) < 10) { 6037 verbose(VERB_ALGO, "xfr to %s failed, packet with " 6038 "truncated RR", 6039 xfr->task_transfer->master->host); 6040 return 0; 6041 } 6042 (void)sldns_buffer_read_u16(pkt); /* type */ 6043 (void)sldns_buffer_read_u16(pkt); /* class */ 6044 (void)sldns_buffer_read_u32(pkt); /* ttl */ 6045 rdlen = sldns_buffer_read_u16(pkt); 6046 if(sldns_buffer_remaining(pkt) < rdlen) { 6047 verbose(VERB_ALGO, "xfr to %s failed, packet with " 6048 "truncated RR rdata", 6049 xfr->task_transfer->master->host); 6050 return 0; 6051 } 6052 /* skip over RR rdata to go to the next RR */ 6053 sldns_buffer_skip(pkt, (ssize_t)rdlen); 6054 } 6055 6056 return 1; 6057 } 6058 6059 /** Link the data from this packet into the worklist of transferred data */ 6060 static int 6061 xfer_link_data(sldns_buffer* pkt, struct auth_xfer* xfr) 6062 { 6063 /* alloc it */ 6064 struct auth_chunk* e; 6065 e = (struct auth_chunk*)calloc(1, sizeof(*e)); 6066 if(!e) return 0; 6067 e->next = NULL; 6068 e->len = sldns_buffer_limit(pkt); 6069 e->data = memdup(sldns_buffer_begin(pkt), e->len); 6070 if(!e->data) { 6071 free(e); 6072 return 0; 6073 } 6074 6075 /* alloc succeeded, link into list */ 6076 if(!xfr->task_transfer->chunks_first) 6077 xfr->task_transfer->chunks_first = e; 6078 if(xfr->task_transfer->chunks_last) 6079 xfr->task_transfer->chunks_last->next = e; 6080 xfr->task_transfer->chunks_last = e; 6081 return 1; 6082 } 6083 6084 /** task transfer. the list of data is complete. process it and if failed 6085 * move to next master, if succeeded, end the task transfer */ 6086 static void 6087 process_list_end_transfer(struct auth_xfer* xfr, struct module_env* env) 6088 { 6089 int ixfr_fail = 0; 6090 if(xfr_process_chunk_list(xfr, env, &ixfr_fail)) { 6091 /* it worked! */ 6092 auth_chunks_delete(xfr->task_transfer); 6093 6094 /* we fetched the zone, move to wait task */ 6095 xfr_transfer_disown(xfr); 6096 6097 if(xfr->notify_received && (!xfr->notify_has_serial || 6098 (xfr->notify_has_serial && 6099 xfr_serial_means_update(xfr, xfr->notify_serial)))) { 6100 uint32_t sr = xfr->notify_serial; 6101 int has_sr = xfr->notify_has_serial; 6102 /* we received a notify while probe/transfer was 6103 * in progress. start a new probe and transfer */ 6104 xfr->notify_received = 0; 6105 xfr->notify_has_serial = 0; 6106 xfr->notify_serial = 0; 6107 if(!xfr_start_probe(xfr, env, NULL)) { 6108 /* if we couldn't start it, already in 6109 * progress; restore notify serial, 6110 * while xfr still locked */ 6111 xfr->notify_received = 1; 6112 xfr->notify_has_serial = has_sr; 6113 xfr->notify_serial = sr; 6114 lock_basic_unlock(&xfr->lock); 6115 } 6116 return; 6117 } else { 6118 /* pick up the nextprobe task and wait (normail wait time) */ 6119 if(xfr->task_nextprobe->worker == NULL) 6120 xfr_set_timeout(xfr, env, 0, 0); 6121 } 6122 lock_basic_unlock(&xfr->lock); 6123 return; 6124 } 6125 /* processing failed */ 6126 /* when done, delete data from list */ 6127 auth_chunks_delete(xfr->task_transfer); 6128 if(ixfr_fail) { 6129 xfr->task_transfer->ixfr_fail = 1; 6130 } else { 6131 xfr_transfer_nextmaster(xfr); 6132 } 6133 xfr_transfer_nexttarget_or_end(xfr, env); 6134 } 6135 6136 /** callback for the task_transfer timer */ 6137 void 6138 auth_xfer_transfer_timer_callback(void* arg) 6139 { 6140 struct auth_xfer* xfr = (struct auth_xfer*)arg; 6141 struct module_env* env; 6142 int gonextonfail = 1; 6143 log_assert(xfr->task_transfer); 6144 lock_basic_lock(&xfr->lock); 6145 env = xfr->task_transfer->env; 6146 if(!env || env->outnet->want_to_quit) { 6147 lock_basic_unlock(&xfr->lock); 6148 return; /* stop on quit */ 6149 } 6150 6151 verbose(VERB_ALGO, "xfr stopped, connection timeout to %s", 6152 xfr->task_transfer->master->host); 6153 6154 /* see if IXFR caused the failure, if so, try AXFR */ 6155 if(xfr->task_transfer->on_ixfr) { 6156 xfr->task_transfer->ixfr_possible_timeout_count++; 6157 if(xfr->task_transfer->ixfr_possible_timeout_count >= 6158 NUM_TIMEOUTS_FALLBACK_IXFR) { 6159 verbose(VERB_ALGO, "xfr to %s, fallback " 6160 "from IXFR to AXFR (because of timeouts)", 6161 xfr->task_transfer->master->host); 6162 xfr->task_transfer->ixfr_fail = 1; 6163 gonextonfail = 0; 6164 } 6165 } 6166 6167 /* delete transferred data from list */ 6168 auth_chunks_delete(xfr->task_transfer); 6169 comm_point_delete(xfr->task_transfer->cp); 6170 xfr->task_transfer->cp = NULL; 6171 if(gonextonfail) 6172 xfr_transfer_nextmaster(xfr); 6173 xfr_transfer_nexttarget_or_end(xfr, env); 6174 } 6175 6176 /** callback for task_transfer tcp connections */ 6177 int 6178 auth_xfer_transfer_tcp_callback(struct comm_point* c, void* arg, int err, 6179 struct comm_reply* ATTR_UNUSED(repinfo)) 6180 { 6181 struct auth_xfer* xfr = (struct auth_xfer*)arg; 6182 struct module_env* env; 6183 int gonextonfail = 1; 6184 int transferdone = 0; 6185 log_assert(xfr->task_transfer); 6186 lock_basic_lock(&xfr->lock); 6187 env = xfr->task_transfer->env; 6188 if(!env || env->outnet->want_to_quit) { 6189 lock_basic_unlock(&xfr->lock); 6190 return 0; /* stop on quit */ 6191 } 6192 /* stop the timer */ 6193 comm_timer_disable(xfr->task_transfer->timer); 6194 6195 if(err != NETEVENT_NOERROR) { 6196 /* connection failed, closed, or timeout */ 6197 /* stop this transfer, cleanup 6198 * and continue task_transfer*/ 6199 verbose(VERB_ALGO, "xfr stopped, connection lost to %s", 6200 xfr->task_transfer->master->host); 6201 6202 /* see if IXFR caused the failure, if so, try AXFR */ 6203 if(xfr->task_transfer->on_ixfr) { 6204 xfr->task_transfer->ixfr_possible_timeout_count++; 6205 if(xfr->task_transfer->ixfr_possible_timeout_count >= 6206 NUM_TIMEOUTS_FALLBACK_IXFR) { 6207 verbose(VERB_ALGO, "xfr to %s, fallback " 6208 "from IXFR to AXFR (because of timeouts)", 6209 xfr->task_transfer->master->host); 6210 xfr->task_transfer->ixfr_fail = 1; 6211 gonextonfail = 0; 6212 } 6213 } 6214 6215 failed: 6216 /* delete transferred data from list */ 6217 auth_chunks_delete(xfr->task_transfer); 6218 comm_point_delete(xfr->task_transfer->cp); 6219 xfr->task_transfer->cp = NULL; 6220 if(gonextonfail) 6221 xfr_transfer_nextmaster(xfr); 6222 xfr_transfer_nexttarget_or_end(xfr, env); 6223 return 0; 6224 } 6225 /* note that IXFR worked without timeout */ 6226 if(xfr->task_transfer->on_ixfr) 6227 xfr->task_transfer->ixfr_possible_timeout_count = 0; 6228 6229 /* handle returned packet */ 6230 /* if it fails, cleanup and end this transfer */ 6231 /* if it needs to fallback from IXFR to AXFR, do that */ 6232 if(!check_xfer_packet(c->buffer, xfr, &gonextonfail, &transferdone)) { 6233 goto failed; 6234 } 6235 /* if it is good, link it into the list of data */ 6236 /* if the link into list of data fails (malloc fail) cleanup and end */ 6237 if(!xfer_link_data(c->buffer, xfr)) { 6238 verbose(VERB_ALGO, "xfr stopped to %s, malloc failed", 6239 xfr->task_transfer->master->host); 6240 goto failed; 6241 } 6242 /* if the transfer is done now, disconnect and process the list */ 6243 if(transferdone) { 6244 comm_point_delete(xfr->task_transfer->cp); 6245 xfr->task_transfer->cp = NULL; 6246 process_list_end_transfer(xfr, env); 6247 return 0; 6248 } 6249 6250 /* if we want to read more messages, setup the commpoint to read 6251 * a DNS packet, and the timeout */ 6252 lock_basic_unlock(&xfr->lock); 6253 c->tcp_is_reading = 1; 6254 sldns_buffer_clear(c->buffer); 6255 comm_point_start_listening(c, -1, AUTH_TRANSFER_TIMEOUT); 6256 return 0; 6257 } 6258 6259 /** callback for task_transfer http connections */ 6260 int 6261 auth_xfer_transfer_http_callback(struct comm_point* c, void* arg, int err, 6262 struct comm_reply* repinfo) 6263 { 6264 struct auth_xfer* xfr = (struct auth_xfer*)arg; 6265 struct module_env* env; 6266 log_assert(xfr->task_transfer); 6267 lock_basic_lock(&xfr->lock); 6268 env = xfr->task_transfer->env; 6269 if(!env || env->outnet->want_to_quit) { 6270 lock_basic_unlock(&xfr->lock); 6271 return 0; /* stop on quit */ 6272 } 6273 verbose(VERB_ALGO, "auth zone transfer http callback"); 6274 /* stop the timer */ 6275 comm_timer_disable(xfr->task_transfer->timer); 6276 6277 if(err != NETEVENT_NOERROR && err != NETEVENT_DONE) { 6278 /* connection failed, closed, or timeout */ 6279 /* stop this transfer, cleanup 6280 * and continue task_transfer*/ 6281 verbose(VERB_ALGO, "http stopped, connection lost to %s", 6282 xfr->task_transfer->master->host); 6283 failed: 6284 /* delete transferred data from list */ 6285 auth_chunks_delete(xfr->task_transfer); 6286 if(repinfo) repinfo->c = NULL; /* signal cp deleted to 6287 the routine calling this callback */ 6288 comm_point_delete(xfr->task_transfer->cp); 6289 xfr->task_transfer->cp = NULL; 6290 xfr_transfer_nextmaster(xfr); 6291 xfr_transfer_nexttarget_or_end(xfr, env); 6292 return 0; 6293 } 6294 6295 /* if it is good, link it into the list of data */ 6296 /* if the link into list of data fails (malloc fail) cleanup and end */ 6297 if(sldns_buffer_limit(c->buffer) > 0) { 6298 verbose(VERB_ALGO, "auth zone http queued up %d bytes", 6299 (int)sldns_buffer_limit(c->buffer)); 6300 if(!xfer_link_data(c->buffer, xfr)) { 6301 verbose(VERB_ALGO, "http stopped to %s, malloc failed", 6302 xfr->task_transfer->master->host); 6303 goto failed; 6304 } 6305 } 6306 /* if the transfer is done now, disconnect and process the list */ 6307 if(err == NETEVENT_DONE) { 6308 if(repinfo) repinfo->c = NULL; /* signal cp deleted to 6309 the routine calling this callback */ 6310 comm_point_delete(xfr->task_transfer->cp); 6311 xfr->task_transfer->cp = NULL; 6312 process_list_end_transfer(xfr, env); 6313 return 0; 6314 } 6315 6316 /* if we want to read more messages, setup the commpoint to read 6317 * a DNS packet, and the timeout */ 6318 lock_basic_unlock(&xfr->lock); 6319 c->tcp_is_reading = 1; 6320 sldns_buffer_clear(c->buffer); 6321 comm_point_start_listening(c, -1, AUTH_TRANSFER_TIMEOUT); 6322 return 0; 6323 } 6324 6325 6326 /** start transfer task by this worker , xfr is locked. */ 6327 static void 6328 xfr_start_transfer(struct auth_xfer* xfr, struct module_env* env, 6329 struct auth_master* master) 6330 { 6331 log_assert(xfr->task_transfer != NULL); 6332 log_assert(xfr->task_transfer->worker == NULL); 6333 log_assert(xfr->task_transfer->chunks_first == NULL); 6334 log_assert(xfr->task_transfer->chunks_last == NULL); 6335 xfr->task_transfer->worker = env->worker; 6336 xfr->task_transfer->env = env; 6337 6338 /* init transfer process */ 6339 /* find that master in the transfer's list of masters? */ 6340 xfr_transfer_start_list(xfr, master); 6341 /* start lookup for hostnames in transfer master list */ 6342 xfr_transfer_start_lookups(xfr); 6343 6344 /* initiate TCP, and set timeout on it */ 6345 xfr_transfer_nexttarget_or_end(xfr, env); 6346 } 6347 6348 /** disown task_probe. caller must hold xfr.lock */ 6349 static void 6350 xfr_probe_disown(struct auth_xfer* xfr) 6351 { 6352 /* remove timer (from this worker's event base) */ 6353 comm_timer_delete(xfr->task_probe->timer); 6354 xfr->task_probe->timer = NULL; 6355 /* remove the commpoint */ 6356 comm_point_delete(xfr->task_probe->cp); 6357 xfr->task_probe->cp = NULL; 6358 /* we don't own this item anymore */ 6359 xfr->task_probe->worker = NULL; 6360 xfr->task_probe->env = NULL; 6361 } 6362 6363 /** send the UDP probe to the master, this is part of task_probe */ 6364 static int 6365 xfr_probe_send_probe(struct auth_xfer* xfr, struct module_env* env, 6366 int timeout) 6367 { 6368 struct sockaddr_storage addr; 6369 socklen_t addrlen = 0; 6370 struct timeval t; 6371 /* pick master */ 6372 struct auth_master* master = xfr_probe_current_master(xfr); 6373 char *auth_name = NULL; 6374 if(!master) return 0; 6375 if(master->allow_notify) return 0; /* only for notify */ 6376 if(master->http) return 0; /* only masters get SOA UDP probe, 6377 not urls, if those are in this list */ 6378 6379 /* get master addr */ 6380 if(xfr->task_probe->scan_addr) { 6381 addrlen = xfr->task_probe->scan_addr->addrlen; 6382 memmove(&addr, &xfr->task_probe->scan_addr->addr, addrlen); 6383 } else { 6384 if(!authextstrtoaddr(master->host, &addr, &addrlen, &auth_name)) { 6385 /* the ones that are not in addr format are supposed 6386 * to be looked up. The lookup has failed however, 6387 * so skip them */ 6388 char zname[255+1]; 6389 dname_str(xfr->name, zname); 6390 log_err("%s: failed lookup, cannot probe to master %s", 6391 zname, master->host); 6392 return 0; 6393 } 6394 if (auth_name != NULL) { 6395 if (addr.ss_family == AF_INET 6396 && (int)ntohs(((struct sockaddr_in *)&addr)->sin_port) 6397 == env->cfg->ssl_port) 6398 ((struct sockaddr_in *)&addr)->sin_port 6399 = htons((uint16_t)env->cfg->port); 6400 else if (addr.ss_family == AF_INET6 6401 && (int)ntohs(((struct sockaddr_in6 *)&addr)->sin6_port) 6402 == env->cfg->ssl_port) 6403 ((struct sockaddr_in6 *)&addr)->sin6_port 6404 = htons((uint16_t)env->cfg->port); 6405 } 6406 } 6407 6408 /* create packet */ 6409 /* create new ID for new probes, but not on timeout retries, 6410 * this means we'll accept replies to previous retries to same ip */ 6411 if(timeout == AUTH_PROBE_TIMEOUT) 6412 xfr->task_probe->id = GET_RANDOM_ID(env->rnd); 6413 xfr_create_soa_probe_packet(xfr, env->scratch_buffer, 6414 xfr->task_probe->id); 6415 /* we need to remove the cp if we have a different ip4/ip6 type now */ 6416 if(xfr->task_probe->cp && 6417 ((xfr->task_probe->cp_is_ip6 && !addr_is_ip6(&addr, addrlen)) || 6418 (!xfr->task_probe->cp_is_ip6 && addr_is_ip6(&addr, addrlen))) 6419 ) { 6420 comm_point_delete(xfr->task_probe->cp); 6421 xfr->task_probe->cp = NULL; 6422 } 6423 if(!xfr->task_probe->cp) { 6424 if(addr_is_ip6(&addr, addrlen)) 6425 xfr->task_probe->cp_is_ip6 = 1; 6426 else xfr->task_probe->cp_is_ip6 = 0; 6427 xfr->task_probe->cp = outnet_comm_point_for_udp(env->outnet, 6428 auth_xfer_probe_udp_callback, xfr, &addr, addrlen); 6429 if(!xfr->task_probe->cp) { 6430 char zname[255+1], as[256]; 6431 dname_str(xfr->name, zname); 6432 addr_port_to_str(&addr, addrlen, as, sizeof(as)); 6433 verbose(VERB_ALGO, "cannot create udp cp for " 6434 "probe %s to %s", zname, as); 6435 return 0; 6436 } 6437 } 6438 if(!xfr->task_probe->timer) { 6439 xfr->task_probe->timer = comm_timer_create(env->worker_base, 6440 auth_xfer_probe_timer_callback, xfr); 6441 if(!xfr->task_probe->timer) { 6442 log_err("malloc failure"); 6443 return 0; 6444 } 6445 } 6446 6447 /* send udp packet */ 6448 if(!comm_point_send_udp_msg(xfr->task_probe->cp, env->scratch_buffer, 6449 (struct sockaddr*)&addr, addrlen, 0)) { 6450 char zname[255+1], as[256]; 6451 dname_str(xfr->name, zname); 6452 addr_port_to_str(&addr, addrlen, as, sizeof(as)); 6453 verbose(VERB_ALGO, "failed to send soa probe for %s to %s", 6454 zname, as); 6455 return 0; 6456 } 6457 if(verbosity >= VERB_ALGO) { 6458 char zname[255+1], as[256]; 6459 dname_str(xfr->name, zname); 6460 addr_port_to_str(&addr, addrlen, as, sizeof(as)); 6461 verbose(VERB_ALGO, "auth zone %s soa probe sent to %s", zname, 6462 as); 6463 } 6464 xfr->task_probe->timeout = timeout; 6465 #ifndef S_SPLINT_S 6466 t.tv_sec = timeout/1000; 6467 t.tv_usec = (timeout%1000)*1000; 6468 #endif 6469 comm_timer_set(xfr->task_probe->timer, &t); 6470 6471 return 1; 6472 } 6473 6474 /** callback for task_probe timer */ 6475 void 6476 auth_xfer_probe_timer_callback(void* arg) 6477 { 6478 struct auth_xfer* xfr = (struct auth_xfer*)arg; 6479 struct module_env* env; 6480 log_assert(xfr->task_probe); 6481 lock_basic_lock(&xfr->lock); 6482 env = xfr->task_probe->env; 6483 if(!env || env->outnet->want_to_quit) { 6484 lock_basic_unlock(&xfr->lock); 6485 return; /* stop on quit */ 6486 } 6487 6488 if(verbosity >= VERB_ALGO) { 6489 char zname[255+1]; 6490 dname_str(xfr->name, zname); 6491 verbose(VERB_ALGO, "auth zone %s soa probe timeout", zname); 6492 } 6493 if(xfr->task_probe->timeout <= AUTH_PROBE_TIMEOUT_STOP) { 6494 /* try again with bigger timeout */ 6495 if(xfr_probe_send_probe(xfr, env, xfr->task_probe->timeout*2)) { 6496 lock_basic_unlock(&xfr->lock); 6497 return; 6498 } 6499 } 6500 /* delete commpoint so a new one is created, with a fresh port nr */ 6501 comm_point_delete(xfr->task_probe->cp); 6502 xfr->task_probe->cp = NULL; 6503 6504 /* too many timeouts (or fail to send), move to next or end */ 6505 xfr_probe_nextmaster(xfr); 6506 xfr_probe_send_or_end(xfr, env); 6507 } 6508 6509 /** callback for task_probe udp packets */ 6510 int 6511 auth_xfer_probe_udp_callback(struct comm_point* c, void* arg, int err, 6512 struct comm_reply* repinfo) 6513 { 6514 struct auth_xfer* xfr = (struct auth_xfer*)arg; 6515 struct module_env* env; 6516 log_assert(xfr->task_probe); 6517 lock_basic_lock(&xfr->lock); 6518 env = xfr->task_probe->env; 6519 if(!env || env->outnet->want_to_quit) { 6520 lock_basic_unlock(&xfr->lock); 6521 return 0; /* stop on quit */ 6522 } 6523 6524 /* the comm_point_udp_callback is in a for loop for NUM_UDP_PER_SELECT 6525 * and we set rep.c=NULL to stop if from looking inside the commpoint*/ 6526 repinfo->c = NULL; 6527 /* stop the timer */ 6528 comm_timer_disable(xfr->task_probe->timer); 6529 6530 /* see if we got a packet and what that means */ 6531 if(err == NETEVENT_NOERROR) { 6532 uint32_t serial = 0; 6533 if(check_packet_ok(c->buffer, LDNS_RR_TYPE_SOA, xfr, 6534 &serial)) { 6535 /* successful lookup */ 6536 if(verbosity >= VERB_ALGO) { 6537 char buf[256]; 6538 dname_str(xfr->name, buf); 6539 verbose(VERB_ALGO, "auth zone %s: soa probe " 6540 "serial is %u", buf, (unsigned)serial); 6541 } 6542 /* see if this serial indicates that the zone has 6543 * to be updated */ 6544 if(xfr_serial_means_update(xfr, serial)) { 6545 /* if updated, start the transfer task, if needed */ 6546 verbose(VERB_ALGO, "auth_zone updated, start transfer"); 6547 if(xfr->task_transfer->worker == NULL) { 6548 struct auth_master* master = 6549 xfr_probe_current_master(xfr); 6550 /* if we have download URLs use them 6551 * in preference to this master we 6552 * just probed the SOA from */ 6553 if(xfr->task_transfer->masters && 6554 xfr->task_transfer->masters->http) 6555 master = NULL; 6556 xfr_probe_disown(xfr); 6557 xfr_start_transfer(xfr, env, master); 6558 return 0; 6559 6560 } 6561 /* other tasks are running, we don't do this anymore */ 6562 xfr_probe_disown(xfr); 6563 lock_basic_unlock(&xfr->lock); 6564 /* return, we don't sent a reply to this udp packet, 6565 * and we setup the tasks to do next */ 6566 return 0; 6567 } else { 6568 verbose(VERB_ALGO, "auth_zone master reports unchanged soa serial"); 6569 /* we if cannot find updates amongst the 6570 * masters, this means we then have a new lease 6571 * on the zone */ 6572 xfr->task_probe->have_new_lease = 1; 6573 } 6574 } else { 6575 if(verbosity >= VERB_ALGO) { 6576 char buf[256]; 6577 dname_str(xfr->name, buf); 6578 verbose(VERB_ALGO, "auth zone %s: bad reply to soa probe", buf); 6579 } 6580 } 6581 } else { 6582 if(verbosity >= VERB_ALGO) { 6583 char buf[256]; 6584 dname_str(xfr->name, buf); 6585 verbose(VERB_ALGO, "auth zone %s: soa probe failed", buf); 6586 } 6587 } 6588 6589 /* failed lookup or not an update */ 6590 /* delete commpoint so a new one is created, with a fresh port nr */ 6591 comm_point_delete(xfr->task_probe->cp); 6592 xfr->task_probe->cp = NULL; 6593 6594 /* if the result was not a successful probe, we need 6595 * to send the next one */ 6596 xfr_probe_nextmaster(xfr); 6597 xfr_probe_send_or_end(xfr, env); 6598 return 0; 6599 } 6600 6601 /** lookup a host name for its addresses, if needed */ 6602 static int 6603 xfr_probe_lookup_host(struct auth_xfer* xfr, struct module_env* env) 6604 { 6605 struct sockaddr_storage addr; 6606 socklen_t addrlen = 0; 6607 struct auth_master* master = xfr->task_probe->lookup_target; 6608 struct query_info qinfo; 6609 uint16_t qflags = BIT_RD; 6610 uint8_t dname[LDNS_MAX_DOMAINLEN+1]; 6611 struct edns_data edns; 6612 sldns_buffer* buf = env->scratch_buffer; 6613 if(!master) return 0; 6614 if(extstrtoaddr(master->host, &addr, &addrlen, UNBOUND_DNS_PORT)) { 6615 /* not needed, host is in IP addr format */ 6616 return 0; 6617 } 6618 if(master->allow_notify && !master->http && 6619 strchr(master->host, '/') != NULL && 6620 strchr(master->host, '/') == strrchr(master->host, '/')) { 6621 return 0; /* is IP/prefix format, not something to look up */ 6622 } 6623 6624 /* use mesh_new_callback to probe for non-addr hosts, 6625 * and then wait for them to be looked up (in cache, or query) */ 6626 qinfo.qname_len = sizeof(dname); 6627 if(sldns_str2wire_dname_buf(master->host, dname, &qinfo.qname_len) 6628 != 0) { 6629 log_err("cannot parse host name of master %s", master->host); 6630 return 0; 6631 } 6632 qinfo.qname = dname; 6633 qinfo.qclass = xfr->dclass; 6634 qinfo.qtype = LDNS_RR_TYPE_A; 6635 if(xfr->task_probe->lookup_aaaa) 6636 qinfo.qtype = LDNS_RR_TYPE_AAAA; 6637 qinfo.local_alias = NULL; 6638 if(verbosity >= VERB_ALGO) { 6639 char buf1[512]; 6640 char buf2[LDNS_MAX_DOMAINLEN+1]; 6641 dname_str(xfr->name, buf2); 6642 snprintf(buf1, sizeof(buf1), "auth zone %s: master lookup" 6643 " for task_probe", buf2); 6644 log_query_info(VERB_ALGO, buf1, &qinfo); 6645 } 6646 edns.edns_present = 1; 6647 edns.ext_rcode = 0; 6648 edns.edns_version = 0; 6649 edns.bits = EDNS_DO; 6650 edns.opt_list_in = NULL; 6651 edns.opt_list_out = NULL; 6652 edns.opt_list_inplace_cb_out = NULL; 6653 edns.padding_block_size = 0; 6654 edns.cookie_present = 0; 6655 edns.cookie_valid = 0; 6656 if(sldns_buffer_capacity(buf) < 65535) 6657 edns.udp_size = (uint16_t)sldns_buffer_capacity(buf); 6658 else edns.udp_size = 65535; 6659 6660 /* unlock xfr during mesh_new_callback() because the callback can be 6661 * called straight away */ 6662 lock_basic_unlock(&xfr->lock); 6663 if(!mesh_new_callback(env->mesh, &qinfo, qflags, &edns, buf, 0, 6664 &auth_xfer_probe_lookup_callback, xfr, 0)) { 6665 lock_basic_lock(&xfr->lock); 6666 log_err("out of memory lookup up master %s", master->host); 6667 return 0; 6668 } 6669 lock_basic_lock(&xfr->lock); 6670 return 1; 6671 } 6672 6673 /** move to sending the probe packets, next if fails. task_probe */ 6674 static void 6675 xfr_probe_send_or_end(struct auth_xfer* xfr, struct module_env* env) 6676 { 6677 /* are we doing hostname lookups? */ 6678 while(xfr->task_probe->lookup_target) { 6679 if(xfr_probe_lookup_host(xfr, env)) { 6680 /* wait for lookup to finish, 6681 * note that the hostname may be in unbound's cache 6682 * and we may then get an instant cache response, 6683 * and that calls the callback just like a full 6684 * lookup and lookup failures also call callback */ 6685 if(verbosity >= VERB_ALGO) { 6686 char zname[255+1]; 6687 dname_str(xfr->name, zname); 6688 verbose(VERB_ALGO, "auth zone %s probe next target lookup", zname); 6689 } 6690 lock_basic_unlock(&xfr->lock); 6691 return; 6692 } 6693 xfr_probe_move_to_next_lookup(xfr, env); 6694 } 6695 /* probe of list has ended. Create or refresh the list of of 6696 * allow_notify addrs */ 6697 probe_copy_masters_for_allow_notify(xfr); 6698 if(verbosity >= VERB_ALGO) { 6699 char zname[255+1]; 6700 dname_str(xfr->name, zname); 6701 verbose(VERB_ALGO, "auth zone %s probe: notify addrs updated", zname); 6702 } 6703 if(xfr->task_probe->only_lookup) { 6704 /* only wanted lookups for copy, stop probe and start wait */ 6705 xfr->task_probe->only_lookup = 0; 6706 if(verbosity >= VERB_ALGO) { 6707 char zname[255+1]; 6708 dname_str(xfr->name, zname); 6709 verbose(VERB_ALGO, "auth zone %s probe: finished only_lookup", zname); 6710 } 6711 xfr_probe_disown(xfr); 6712 if(xfr->task_nextprobe->worker == NULL) 6713 xfr_set_timeout(xfr, env, 0, 0); 6714 lock_basic_unlock(&xfr->lock); 6715 return; 6716 } 6717 6718 /* send probe packets */ 6719 while(!xfr_probe_end_of_list(xfr)) { 6720 if(xfr_probe_send_probe(xfr, env, AUTH_PROBE_TIMEOUT)) { 6721 /* successfully sent probe, wait for callback */ 6722 lock_basic_unlock(&xfr->lock); 6723 return; 6724 } 6725 /* failed to send probe, next master */ 6726 xfr_probe_nextmaster(xfr); 6727 } 6728 6729 /* done with probe sequence, wait */ 6730 if(xfr->task_probe->have_new_lease) { 6731 /* if zone not updated, start the wait timer again */ 6732 if(verbosity >= VERB_ALGO) { 6733 char zname[255+1]; 6734 dname_str(xfr->name, zname); 6735 verbose(VERB_ALGO, "auth_zone %s unchanged, new lease, wait", zname); 6736 } 6737 xfr_probe_disown(xfr); 6738 if(xfr->have_zone) 6739 xfr->lease_time = *env->now; 6740 if(xfr->task_nextprobe->worker == NULL) 6741 xfr_set_timeout(xfr, env, 0, 0); 6742 } else { 6743 if(verbosity >= VERB_ALGO) { 6744 char zname[255+1]; 6745 dname_str(xfr->name, zname); 6746 verbose(VERB_ALGO, "auth zone %s soa probe failed, wait to retry", zname); 6747 } 6748 /* we failed to send this as well, move to the wait task, 6749 * use the shorter retry timeout */ 6750 xfr_probe_disown(xfr); 6751 /* pick up the nextprobe task and wait */ 6752 if(xfr->task_nextprobe->worker == NULL) 6753 xfr_set_timeout(xfr, env, 1, 0); 6754 } 6755 6756 lock_basic_unlock(&xfr->lock); 6757 } 6758 6759 /** callback for task_probe lookup of host name, of A or AAAA */ 6760 void auth_xfer_probe_lookup_callback(void* arg, int rcode, sldns_buffer* buf, 6761 enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus), 6762 int ATTR_UNUSED(was_ratelimited)) 6763 { 6764 struct auth_xfer* xfr = (struct auth_xfer*)arg; 6765 struct module_env* env; 6766 log_assert(xfr->task_probe); 6767 lock_basic_lock(&xfr->lock); 6768 env = xfr->task_probe->env; 6769 if(!env || env->outnet->want_to_quit) { 6770 lock_basic_unlock(&xfr->lock); 6771 return; /* stop on quit */ 6772 } 6773 6774 /* process result */ 6775 if(rcode == LDNS_RCODE_NOERROR) { 6776 uint16_t wanted_qtype = LDNS_RR_TYPE_A; 6777 struct regional* temp = env->scratch; 6778 struct query_info rq; 6779 struct reply_info* rep; 6780 if(xfr->task_probe->lookup_aaaa) 6781 wanted_qtype = LDNS_RR_TYPE_AAAA; 6782 memset(&rq, 0, sizeof(rq)); 6783 rep = parse_reply_in_temp_region(buf, temp, &rq); 6784 if(rep && rq.qtype == wanted_qtype && 6785 FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NOERROR) { 6786 /* parsed successfully */ 6787 struct ub_packed_rrset_key* answer = 6788 reply_find_answer_rrset(&rq, rep); 6789 if(answer) { 6790 xfr_master_add_addrs(xfr->task_probe-> 6791 lookup_target, answer, wanted_qtype); 6792 } else { 6793 if(verbosity >= VERB_ALGO) { 6794 char zname[255+1]; 6795 dname_str(xfr->name, zname); 6796 verbose(VERB_ALGO, "auth zone %s host %s type %s probe lookup has nodata", zname, xfr->task_probe->lookup_target->host, (xfr->task_probe->lookup_aaaa?"AAAA":"A")); 6797 } 6798 } 6799 } else { 6800 if(verbosity >= VERB_ALGO) { 6801 char zname[255+1]; 6802 dname_str(xfr->name, zname); 6803 verbose(VERB_ALGO, "auth zone %s host %s type %s probe lookup has no address", zname, xfr->task_probe->lookup_target->host, (xfr->task_probe->lookup_aaaa?"AAAA":"A")); 6804 } 6805 } 6806 regional_free_all(temp); 6807 } else { 6808 if(verbosity >= VERB_ALGO) { 6809 char zname[255+1]; 6810 dname_str(xfr->name, zname); 6811 verbose(VERB_ALGO, "auth zone %s host %s type %s probe lookup failed", zname, xfr->task_probe->lookup_target->host, (xfr->task_probe->lookup_aaaa?"AAAA":"A")); 6812 } 6813 } 6814 if(xfr->task_probe->lookup_target->list && 6815 xfr->task_probe->lookup_target == xfr_probe_current_master(xfr)) 6816 xfr->task_probe->scan_addr = xfr->task_probe->lookup_target->list; 6817 6818 /* move to lookup AAAA after A lookup, move to next hostname lookup, 6819 * or move to send the probes, or, if nothing to do, end task_probe */ 6820 xfr_probe_move_to_next_lookup(xfr, env); 6821 xfr_probe_send_or_end(xfr, env); 6822 } 6823 6824 /** disown task_nextprobe. caller must hold xfr.lock */ 6825 static void 6826 xfr_nextprobe_disown(struct auth_xfer* xfr) 6827 { 6828 /* delete the timer, because the next worker to pick this up may 6829 * not have the same event base */ 6830 comm_timer_delete(xfr->task_nextprobe->timer); 6831 xfr->task_nextprobe->timer = NULL; 6832 xfr->task_nextprobe->next_probe = 0; 6833 /* we don't own this item anymore */ 6834 xfr->task_nextprobe->worker = NULL; 6835 xfr->task_nextprobe->env = NULL; 6836 } 6837 6838 /** xfer nextprobe timeout callback, this is part of task_nextprobe */ 6839 void 6840 auth_xfer_timer(void* arg) 6841 { 6842 struct auth_xfer* xfr = (struct auth_xfer*)arg; 6843 struct module_env* env; 6844 log_assert(xfr->task_nextprobe); 6845 lock_basic_lock(&xfr->lock); 6846 env = xfr->task_nextprobe->env; 6847 if(!env || env->outnet->want_to_quit) { 6848 lock_basic_unlock(&xfr->lock); 6849 return; /* stop on quit */ 6850 } 6851 6852 /* see if zone has expired, and if so, also set auth_zone expired */ 6853 if(xfr->have_zone && !xfr->zone_expired && 6854 *env->now >= xfr->lease_time + xfr->expiry) { 6855 lock_basic_unlock(&xfr->lock); 6856 auth_xfer_set_expired(xfr, env, 1); 6857 lock_basic_lock(&xfr->lock); 6858 } 6859 6860 xfr_nextprobe_disown(xfr); 6861 6862 if(!xfr_start_probe(xfr, env, NULL)) { 6863 /* not started because already in progress */ 6864 lock_basic_unlock(&xfr->lock); 6865 } 6866 } 6867 6868 /** return true if there are probe (SOA UDP query) targets in the master list*/ 6869 static int 6870 have_probe_targets(struct auth_master* list) 6871 { 6872 struct auth_master* p; 6873 for(p=list; p; p = p->next) { 6874 if(!p->allow_notify && p->host) 6875 return 1; 6876 } 6877 return 0; 6878 } 6879 6880 /** start task_probe if possible, if no masters for probe start task_transfer 6881 * returns true if task has been started, and false if the task is already 6882 * in progress. */ 6883 static int 6884 xfr_start_probe(struct auth_xfer* xfr, struct module_env* env, 6885 struct auth_master* spec) 6886 { 6887 /* see if we need to start a probe (or maybe it is already in 6888 * progress (due to notify)) */ 6889 if(xfr->task_probe->worker == NULL) { 6890 if(!have_probe_targets(xfr->task_probe->masters) && 6891 !(xfr->task_probe->only_lookup && 6892 xfr->task_probe->masters != NULL)) { 6893 /* useless to pick up task_probe, no masters to 6894 * probe. Instead attempt to pick up task transfer */ 6895 if(xfr->task_transfer->worker == NULL) { 6896 xfr_start_transfer(xfr, env, spec); 6897 return 1; 6898 } 6899 /* task transfer already in progress */ 6900 return 0; 6901 } 6902 6903 /* pick up the probe task ourselves */ 6904 xfr->task_probe->worker = env->worker; 6905 xfr->task_probe->env = env; 6906 xfr->task_probe->cp = NULL; 6907 6908 /* start the task */ 6909 /* have not seen a new lease yet, this scan */ 6910 xfr->task_probe->have_new_lease = 0; 6911 /* if this was a timeout, no specific first master to scan */ 6912 /* otherwise, spec is nonNULL the notified master, scan 6913 * first and also transfer first from it */ 6914 xfr_probe_start_list(xfr, spec); 6915 /* setup to start the lookup of hostnames of masters afresh */ 6916 xfr_probe_start_lookups(xfr); 6917 /* send the probe packet or next send, or end task */ 6918 xfr_probe_send_or_end(xfr, env); 6919 return 1; 6920 } 6921 return 0; 6922 } 6923 6924 /** for task_nextprobe. 6925 * determine next timeout for auth_xfer. Also (re)sets timer. 6926 * @param xfr: task structure 6927 * @param env: module environment, with worker and time. 6928 * @param failure: set true if timer should be set for failure retry. 6929 * @param lookup_only: only perform lookups when timer done, 0 sec timeout 6930 */ 6931 static void 6932 xfr_set_timeout(struct auth_xfer* xfr, struct module_env* env, 6933 int failure, int lookup_only) 6934 { 6935 struct timeval tv; 6936 log_assert(xfr->task_nextprobe != NULL); 6937 log_assert(xfr->task_nextprobe->worker == NULL || 6938 xfr->task_nextprobe->worker == env->worker); 6939 /* normally, nextprobe = startoflease + refresh, 6940 * but if expiry is sooner, use that one. 6941 * after a failure, use the retry timer instead. */ 6942 xfr->task_nextprobe->next_probe = *env->now; 6943 if(xfr->lease_time && !failure) 6944 xfr->task_nextprobe->next_probe = xfr->lease_time; 6945 6946 if(!failure) { 6947 xfr->task_nextprobe->backoff = 0; 6948 } else { 6949 if(xfr->task_nextprobe->backoff == 0) 6950 xfr->task_nextprobe->backoff = 3; 6951 else xfr->task_nextprobe->backoff *= 2; 6952 if(xfr->task_nextprobe->backoff > AUTH_TRANSFER_MAX_BACKOFF) 6953 xfr->task_nextprobe->backoff = 6954 AUTH_TRANSFER_MAX_BACKOFF; 6955 } 6956 6957 if(xfr->have_zone) { 6958 time_t wait = xfr->refresh; 6959 if(failure) wait = xfr->retry; 6960 if(xfr->expiry < wait) 6961 xfr->task_nextprobe->next_probe += xfr->expiry; 6962 else xfr->task_nextprobe->next_probe += wait; 6963 if(failure) 6964 xfr->task_nextprobe->next_probe += 6965 xfr->task_nextprobe->backoff; 6966 /* put the timer exactly on expiry, if possible */ 6967 if(xfr->lease_time && xfr->lease_time+xfr->expiry < 6968 xfr->task_nextprobe->next_probe && 6969 xfr->lease_time+xfr->expiry > *env->now) 6970 xfr->task_nextprobe->next_probe = 6971 xfr->lease_time+xfr->expiry; 6972 } else { 6973 xfr->task_nextprobe->next_probe += 6974 xfr->task_nextprobe->backoff; 6975 } 6976 6977 if(!xfr->task_nextprobe->timer) { 6978 xfr->task_nextprobe->timer = comm_timer_create( 6979 env->worker_base, auth_xfer_timer, xfr); 6980 if(!xfr->task_nextprobe->timer) { 6981 /* failed to malloc memory. likely zone transfer 6982 * also fails for that. skip the timeout */ 6983 char zname[255+1]; 6984 dname_str(xfr->name, zname); 6985 log_err("cannot allocate timer, no refresh for %s", 6986 zname); 6987 return; 6988 } 6989 } 6990 xfr->task_nextprobe->worker = env->worker; 6991 xfr->task_nextprobe->env = env; 6992 if(*(xfr->task_nextprobe->env->now) <= xfr->task_nextprobe->next_probe) 6993 tv.tv_sec = xfr->task_nextprobe->next_probe - 6994 *(xfr->task_nextprobe->env->now); 6995 else tv.tv_sec = 0; 6996 if(tv.tv_sec != 0 && lookup_only && xfr->task_probe->masters) { 6997 /* don't lookup_only, if lookup timeout is 0 anyway, 6998 * or if we don't have masters to lookup */ 6999 tv.tv_sec = 0; 7000 if(xfr->task_probe->worker == NULL) 7001 xfr->task_probe->only_lookup = 1; 7002 } 7003 if(verbosity >= VERB_ALGO) { 7004 char zname[255+1]; 7005 dname_str(xfr->name, zname); 7006 verbose(VERB_ALGO, "auth zone %s timeout in %d seconds", 7007 zname, (int)tv.tv_sec); 7008 } 7009 tv.tv_usec = 0; 7010 comm_timer_set(xfr->task_nextprobe->timer, &tv); 7011 } 7012 7013 /** initial pick up of worker timeouts, ties events to worker event loop */ 7014 void 7015 auth_xfer_pickup_initial(struct auth_zones* az, struct module_env* env) 7016 { 7017 struct auth_xfer* x; 7018 lock_rw_wrlock(&az->lock); 7019 RBTREE_FOR(x, struct auth_xfer*, &az->xtree) { 7020 lock_basic_lock(&x->lock); 7021 /* set lease_time, because we now have timestamp in env, 7022 * (not earlier during startup and apply_cfg), and this 7023 * notes the start time when the data was acquired */ 7024 if(x->have_zone) 7025 x->lease_time = *env->now; 7026 if(x->task_nextprobe && x->task_nextprobe->worker == NULL) { 7027 xfr_set_timeout(x, env, 0, 1); 7028 } 7029 lock_basic_unlock(&x->lock); 7030 } 7031 lock_rw_unlock(&az->lock); 7032 } 7033 7034 void auth_zones_cleanup(struct auth_zones* az) 7035 { 7036 struct auth_xfer* x; 7037 lock_rw_wrlock(&az->lock); 7038 RBTREE_FOR(x, struct auth_xfer*, &az->xtree) { 7039 lock_basic_lock(&x->lock); 7040 if(x->task_nextprobe && x->task_nextprobe->worker != NULL) { 7041 xfr_nextprobe_disown(x); 7042 } 7043 if(x->task_probe && x->task_probe->worker != NULL) { 7044 xfr_probe_disown(x); 7045 } 7046 if(x->task_transfer && x->task_transfer->worker != NULL) { 7047 auth_chunks_delete(x->task_transfer); 7048 xfr_transfer_disown(x); 7049 } 7050 lock_basic_unlock(&x->lock); 7051 } 7052 lock_rw_unlock(&az->lock); 7053 } 7054 7055 /** 7056 * malloc the xfer and tasks 7057 * @param z: auth_zone with name of zone. 7058 */ 7059 static struct auth_xfer* 7060 auth_xfer_new(struct auth_zone* z) 7061 { 7062 struct auth_xfer* xfr; 7063 xfr = (struct auth_xfer*)calloc(1, sizeof(*xfr)); 7064 if(!xfr) return NULL; 7065 xfr->name = memdup(z->name, z->namelen); 7066 if(!xfr->name) { 7067 free(xfr); 7068 return NULL; 7069 } 7070 xfr->node.key = xfr; 7071 xfr->namelen = z->namelen; 7072 xfr->namelabs = z->namelabs; 7073 xfr->dclass = z->dclass; 7074 7075 xfr->task_nextprobe = (struct auth_nextprobe*)calloc(1, 7076 sizeof(struct auth_nextprobe)); 7077 if(!xfr->task_nextprobe) { 7078 free(xfr->name); 7079 free(xfr); 7080 return NULL; 7081 } 7082 xfr->task_probe = (struct auth_probe*)calloc(1, 7083 sizeof(struct auth_probe)); 7084 if(!xfr->task_probe) { 7085 free(xfr->task_nextprobe); 7086 free(xfr->name); 7087 free(xfr); 7088 return NULL; 7089 } 7090 xfr->task_transfer = (struct auth_transfer*)calloc(1, 7091 sizeof(struct auth_transfer)); 7092 if(!xfr->task_transfer) { 7093 free(xfr->task_probe); 7094 free(xfr->task_nextprobe); 7095 free(xfr->name); 7096 free(xfr); 7097 return NULL; 7098 } 7099 7100 lock_basic_init(&xfr->lock); 7101 lock_protect(&xfr->lock, &xfr->name, sizeof(xfr->name)); 7102 lock_protect(&xfr->lock, &xfr->namelen, sizeof(xfr->namelen)); 7103 lock_protect(&xfr->lock, xfr->name, xfr->namelen); 7104 lock_protect(&xfr->lock, &xfr->namelabs, sizeof(xfr->namelabs)); 7105 lock_protect(&xfr->lock, &xfr->dclass, sizeof(xfr->dclass)); 7106 lock_protect(&xfr->lock, &xfr->notify_received, sizeof(xfr->notify_received)); 7107 lock_protect(&xfr->lock, &xfr->notify_serial, sizeof(xfr->notify_serial)); 7108 lock_protect(&xfr->lock, &xfr->zone_expired, sizeof(xfr->zone_expired)); 7109 lock_protect(&xfr->lock, &xfr->have_zone, sizeof(xfr->have_zone)); 7110 lock_protect(&xfr->lock, &xfr->serial, sizeof(xfr->serial)); 7111 lock_protect(&xfr->lock, &xfr->retry, sizeof(xfr->retry)); 7112 lock_protect(&xfr->lock, &xfr->refresh, sizeof(xfr->refresh)); 7113 lock_protect(&xfr->lock, &xfr->expiry, sizeof(xfr->expiry)); 7114 lock_protect(&xfr->lock, &xfr->lease_time, sizeof(xfr->lease_time)); 7115 lock_protect(&xfr->lock, &xfr->task_nextprobe->worker, 7116 sizeof(xfr->task_nextprobe->worker)); 7117 lock_protect(&xfr->lock, &xfr->task_probe->worker, 7118 sizeof(xfr->task_probe->worker)); 7119 lock_protect(&xfr->lock, &xfr->task_transfer->worker, 7120 sizeof(xfr->task_transfer->worker)); 7121 lock_basic_lock(&xfr->lock); 7122 return xfr; 7123 } 7124 7125 /** Create auth_xfer structure. 7126 * This populates the have_zone, soa values, and so on times. 7127 * and sets the timeout, if a zone transfer is needed a short timeout is set. 7128 * For that the auth_zone itself must exist (and read in zonefile) 7129 * returns false on alloc failure. */ 7130 struct auth_xfer* 7131 auth_xfer_create(struct auth_zones* az, struct auth_zone* z) 7132 { 7133 struct auth_xfer* xfr; 7134 7135 /* malloc it */ 7136 xfr = auth_xfer_new(z); 7137 if(!xfr) { 7138 log_err("malloc failure"); 7139 return NULL; 7140 } 7141 /* insert in tree */ 7142 (void)rbtree_insert(&az->xtree, &xfr->node); 7143 return xfr; 7144 } 7145 7146 /** create new auth_master structure */ 7147 static struct auth_master* 7148 auth_master_new(struct auth_master*** list) 7149 { 7150 struct auth_master *m; 7151 m = (struct auth_master*)calloc(1, sizeof(*m)); 7152 if(!m) { 7153 log_err("malloc failure"); 7154 return NULL; 7155 } 7156 /* set first pointer to m, or next pointer of previous element to m */ 7157 (**list) = m; 7158 /* store m's next pointer as future point to store at */ 7159 (*list) = &(m->next); 7160 return m; 7161 } 7162 7163 /** dup_prefix : create string from initial part of other string, malloced */ 7164 static char* 7165 dup_prefix(char* str, size_t num) 7166 { 7167 char* result; 7168 size_t len = strlen(str); 7169 if(len < num) num = len; /* not more than strlen */ 7170 result = (char*)malloc(num+1); 7171 if(!result) { 7172 log_err("malloc failure"); 7173 return result; 7174 } 7175 memmove(result, str, num); 7176 result[num] = 0; 7177 return result; 7178 } 7179 7180 /** dup string and print error on error */ 7181 static char* 7182 dup_all(char* str) 7183 { 7184 char* result = strdup(str); 7185 if(!result) { 7186 log_err("malloc failure"); 7187 return NULL; 7188 } 7189 return result; 7190 } 7191 7192 /** find first of two characters */ 7193 static char* 7194 str_find_first_of_chars(char* s, char a, char b) 7195 { 7196 char* ra = strchr(s, a); 7197 char* rb = strchr(s, b); 7198 if(!ra) return rb; 7199 if(!rb) return ra; 7200 if(ra < rb) return ra; 7201 return rb; 7202 } 7203 7204 /** parse URL into host and file parts, false on malloc or parse error */ 7205 static int 7206 parse_url(char* url, char** host, char** file, int* port, int* ssl) 7207 { 7208 char* p = url; 7209 /* parse http://www.example.com/file.htm 7210 * or http://127.0.0.1 (index.html) 7211 * or https://[::1@1234]/a/b/c/d */ 7212 *ssl = 1; 7213 *port = AUTH_HTTPS_PORT; 7214 7215 /* parse http:// or https:// */ 7216 if(strncmp(p, "http://", 7) == 0) { 7217 p += 7; 7218 *ssl = 0; 7219 *port = AUTH_HTTP_PORT; 7220 } else if(strncmp(p, "https://", 8) == 0) { 7221 p += 8; 7222 } else if(strstr(p, "://") && strchr(p, '/') > strstr(p, "://") && 7223 strchr(p, ':') >= strstr(p, "://")) { 7224 char* uri = dup_prefix(p, (size_t)(strstr(p, "://")-p)); 7225 log_err("protocol %s:// not supported (for url %s)", 7226 uri?uri:"", p); 7227 free(uri); 7228 return 0; 7229 } 7230 7231 /* parse hostname part */ 7232 if(p[0] == '[') { 7233 char* end = strchr(p, ']'); 7234 p++; /* skip over [ */ 7235 if(end) { 7236 *host = dup_prefix(p, (size_t)(end-p)); 7237 if(!*host) return 0; 7238 p = end+1; /* skip over ] */ 7239 } else { 7240 *host = dup_all(p); 7241 if(!*host) return 0; 7242 p = end; 7243 } 7244 } else { 7245 char* end = str_find_first_of_chars(p, ':', '/'); 7246 if(end) { 7247 *host = dup_prefix(p, (size_t)(end-p)); 7248 if(!*host) return 0; 7249 } else { 7250 *host = dup_all(p); 7251 if(!*host) return 0; 7252 } 7253 p = end; /* at next : or / or NULL */ 7254 } 7255 7256 /* parse port number */ 7257 if(p && p[0] == ':') { 7258 char* end = NULL; 7259 *port = strtol(p+1, &end, 10); 7260 p = end; 7261 } 7262 7263 /* parse filename part */ 7264 while(p && *p == '/') 7265 p++; 7266 if(!p || p[0] == 0) 7267 *file = strdup("/"); 7268 else *file = strdup(p); 7269 if(!*file) { 7270 log_err("malloc failure"); 7271 return 0; 7272 } 7273 return 1; 7274 } 7275 7276 int 7277 xfer_set_masters(struct auth_master** list, struct config_auth* c, 7278 int with_http) 7279 { 7280 struct auth_master* m; 7281 struct config_strlist* p; 7282 /* list points to the first, or next pointer for the new element */ 7283 while(*list) { 7284 list = &( (*list)->next ); 7285 } 7286 if(with_http) 7287 for(p = c->urls; p; p = p->next) { 7288 m = auth_master_new(&list); 7289 if(!m) return 0; 7290 m->http = 1; 7291 if(!parse_url(p->str, &m->host, &m->file, &m->port, &m->ssl)) 7292 return 0; 7293 } 7294 for(p = c->masters; p; p = p->next) { 7295 m = auth_master_new(&list); 7296 if(!m) return 0; 7297 m->ixfr = 1; /* this flag is not configurable */ 7298 m->host = strdup(p->str); 7299 if(!m->host) { 7300 log_err("malloc failure"); 7301 return 0; 7302 } 7303 } 7304 for(p = c->allow_notify; p; p = p->next) { 7305 m = auth_master_new(&list); 7306 if(!m) return 0; 7307 m->allow_notify = 1; 7308 m->host = strdup(p->str); 7309 if(!m->host) { 7310 log_err("malloc failure"); 7311 return 0; 7312 } 7313 } 7314 return 1; 7315 } 7316 7317 #define SERIAL_BITS 32 7318 int 7319 compare_serial(uint32_t a, uint32_t b) 7320 { 7321 const uint32_t cutoff = ((uint32_t) 1 << (SERIAL_BITS - 1)); 7322 7323 if (a == b) { 7324 return 0; 7325 } else if ((a < b && b - a < cutoff) || (a > b && a - b > cutoff)) { 7326 return -1; 7327 } else { 7328 return 1; 7329 } 7330 } 7331 7332 int zonemd_hashalgo_supported(int hashalgo) 7333 { 7334 if(hashalgo == ZONEMD_ALGO_SHA384) return 1; 7335 if(hashalgo == ZONEMD_ALGO_SHA512) return 1; 7336 return 0; 7337 } 7338 7339 int zonemd_scheme_supported(int scheme) 7340 { 7341 if(scheme == ZONEMD_SCHEME_SIMPLE) return 1; 7342 return 0; 7343 } 7344 7345 /** initialize hash for hashing with zonemd hash algo */ 7346 static struct secalgo_hash* zonemd_digest_init(int hashalgo, char** reason) 7347 { 7348 struct secalgo_hash *h; 7349 if(hashalgo == ZONEMD_ALGO_SHA384) { 7350 /* sha384 */ 7351 h = secalgo_hash_create_sha384(); 7352 if(!h) 7353 *reason = "digest sha384 could not be created"; 7354 return h; 7355 } else if(hashalgo == ZONEMD_ALGO_SHA512) { 7356 /* sha512 */ 7357 h = secalgo_hash_create_sha512(); 7358 if(!h) 7359 *reason = "digest sha512 could not be created"; 7360 return h; 7361 } 7362 /* unknown hash algo */ 7363 *reason = "unsupported algorithm"; 7364 return NULL; 7365 } 7366 7367 /** update the hash for zonemd */ 7368 static int zonemd_digest_update(int hashalgo, struct secalgo_hash* h, 7369 uint8_t* data, size_t len, char** reason) 7370 { 7371 if(hashalgo == ZONEMD_ALGO_SHA384) { 7372 if(!secalgo_hash_update(h, data, len)) { 7373 *reason = "digest sha384 failed"; 7374 return 0; 7375 } 7376 return 1; 7377 } else if(hashalgo == ZONEMD_ALGO_SHA512) { 7378 if(!secalgo_hash_update(h, data, len)) { 7379 *reason = "digest sha512 failed"; 7380 return 0; 7381 } 7382 return 1; 7383 } 7384 /* unknown hash algo */ 7385 *reason = "unsupported algorithm"; 7386 return 0; 7387 } 7388 7389 /** finish the hash for zonemd */ 7390 static int zonemd_digest_finish(int hashalgo, struct secalgo_hash* h, 7391 uint8_t* result, size_t hashlen, size_t* resultlen, char** reason) 7392 { 7393 if(hashalgo == ZONEMD_ALGO_SHA384) { 7394 if(hashlen < 384/8) { 7395 *reason = "digest buffer too small for sha384"; 7396 return 0; 7397 } 7398 if(!secalgo_hash_final(h, result, hashlen, resultlen)) { 7399 *reason = "digest sha384 finish failed"; 7400 return 0; 7401 } 7402 return 1; 7403 } else if(hashalgo == ZONEMD_ALGO_SHA512) { 7404 if(hashlen < 512/8) { 7405 *reason = "digest buffer too small for sha512"; 7406 return 0; 7407 } 7408 if(!secalgo_hash_final(h, result, hashlen, resultlen)) { 7409 *reason = "digest sha512 finish failed"; 7410 return 0; 7411 } 7412 return 1; 7413 } 7414 /* unknown algo */ 7415 *reason = "unsupported algorithm"; 7416 return 0; 7417 } 7418 7419 /** add rrsets from node to the list */ 7420 static size_t authdata_rrsets_to_list(struct auth_rrset** array, 7421 size_t arraysize, struct auth_rrset* first) 7422 { 7423 struct auth_rrset* rrset = first; 7424 size_t num = 0; 7425 while(rrset) { 7426 if(num >= arraysize) 7427 return num; 7428 array[num] = rrset; 7429 num++; 7430 rrset = rrset->next; 7431 } 7432 return num; 7433 } 7434 7435 /** compare rr list entries */ 7436 static int rrlist_compare(const void* arg1, const void* arg2) 7437 { 7438 struct auth_rrset* r1 = *(struct auth_rrset**)arg1; 7439 struct auth_rrset* r2 = *(struct auth_rrset**)arg2; 7440 uint16_t t1, t2; 7441 if(r1 == NULL) t1 = LDNS_RR_TYPE_RRSIG; 7442 else t1 = r1->type; 7443 if(r2 == NULL) t2 = LDNS_RR_TYPE_RRSIG; 7444 else t2 = r2->type; 7445 if(t1 < t2) 7446 return -1; 7447 if(t1 > t2) 7448 return 1; 7449 return 0; 7450 } 7451 7452 /** add type RRSIG to rr list if not one there already, 7453 * this is to perform RRSIG collate processing at that point. */ 7454 static void addrrsigtype_if_needed(struct auth_rrset** array, 7455 size_t arraysize, size_t* rrnum, struct auth_data* node) 7456 { 7457 if(az_domain_rrset(node, LDNS_RR_TYPE_RRSIG)) 7458 return; /* already one there */ 7459 if((*rrnum) >= arraysize) 7460 return; /* array too small? */ 7461 array[*rrnum] = NULL; /* nothing there, but need entry in list */ 7462 (*rrnum)++; 7463 } 7464 7465 /** collate the RRs in an RRset using the simple scheme */ 7466 static int zonemd_simple_rrset(struct auth_zone* z, int hashalgo, 7467 struct secalgo_hash* h, struct auth_data* node, 7468 struct auth_rrset* rrset, struct regional* region, 7469 struct sldns_buffer* buf, char** reason) 7470 { 7471 /* canonicalize */ 7472 struct ub_packed_rrset_key key; 7473 memset(&key, 0, sizeof(key)); 7474 key.entry.key = &key; 7475 key.entry.data = rrset->data; 7476 key.rk.dname = node->name; 7477 key.rk.dname_len = node->namelen; 7478 key.rk.type = htons(rrset->type); 7479 key.rk.rrset_class = htons(z->dclass); 7480 if(!rrset_canonicalize_to_buffer(region, buf, &key)) { 7481 *reason = "out of memory"; 7482 return 0; 7483 } 7484 regional_free_all(region); 7485 7486 /* hash */ 7487 if(!zonemd_digest_update(hashalgo, h, sldns_buffer_begin(buf), 7488 sldns_buffer_limit(buf), reason)) { 7489 return 0; 7490 } 7491 return 1; 7492 } 7493 7494 /** count number of RRSIGs in a domain name rrset list */ 7495 static size_t zonemd_simple_count_rrsig(struct auth_rrset* rrset, 7496 struct auth_rrset** rrlist, size_t rrnum, 7497 struct auth_zone* z, struct auth_data* node) 7498 { 7499 size_t i, count = 0; 7500 if(rrset) { 7501 size_t j; 7502 for(j = 0; j<rrset->data->count; j++) { 7503 if(rrsig_rdata_get_type_covered(rrset->data-> 7504 rr_data[j], rrset->data->rr_len[j]) == 7505 LDNS_RR_TYPE_ZONEMD && 7506 query_dname_compare(z->name, node->name)==0) { 7507 /* omit RRSIGs over type ZONEMD at apex */ 7508 continue; 7509 } 7510 count++; 7511 } 7512 } 7513 for(i=0; i<rrnum; i++) { 7514 if(rrlist[i] && rrlist[i]->type == LDNS_RR_TYPE_ZONEMD && 7515 query_dname_compare(z->name, node->name)==0) { 7516 /* omit RRSIGs over type ZONEMD at apex */ 7517 continue; 7518 } 7519 count += (rrlist[i]?rrlist[i]->data->rrsig_count:0); 7520 } 7521 return count; 7522 } 7523 7524 /** allocate sparse rrset data for the number of entries in tepm region */ 7525 static int zonemd_simple_rrsig_allocs(struct regional* region, 7526 struct packed_rrset_data* data, size_t count) 7527 { 7528 data->rr_len = regional_alloc(region, sizeof(*data->rr_len) * count); 7529 if(!data->rr_len) { 7530 return 0; 7531 } 7532 data->rr_ttl = regional_alloc(region, sizeof(*data->rr_ttl) * count); 7533 if(!data->rr_ttl) { 7534 return 0; 7535 } 7536 data->rr_data = regional_alloc(region, sizeof(*data->rr_data) * count); 7537 if(!data->rr_data) { 7538 return 0; 7539 } 7540 return 1; 7541 } 7542 7543 /** add the RRSIGs from the rrs in the domain into the data */ 7544 static void add_rrlist_rrsigs_into_data(struct packed_rrset_data* data, 7545 size_t* done, struct auth_rrset** rrlist, size_t rrnum, 7546 struct auth_zone* z, struct auth_data* node) 7547 { 7548 size_t i; 7549 for(i=0; i<rrnum; i++) { 7550 size_t j; 7551 if(!rrlist[i]) 7552 continue; 7553 if(rrlist[i]->type == LDNS_RR_TYPE_ZONEMD && 7554 query_dname_compare(z->name, node->name)==0) { 7555 /* omit RRSIGs over type ZONEMD at apex */ 7556 continue; 7557 } 7558 for(j = 0; j<rrlist[i]->data->rrsig_count; j++) { 7559 data->rr_len[*done] = rrlist[i]->data->rr_len[rrlist[i]->data->count + j]; 7560 data->rr_ttl[*done] = rrlist[i]->data->rr_ttl[rrlist[i]->data->count + j]; 7561 /* reference the rdata in the rrset, no need to 7562 * copy it, it is no longer needed at the end of 7563 * the routine */ 7564 data->rr_data[*done] = rrlist[i]->data->rr_data[rrlist[i]->data->count + j]; 7565 (*done)++; 7566 } 7567 } 7568 } 7569 7570 static void add_rrset_into_data(struct packed_rrset_data* data, 7571 size_t* done, struct auth_rrset* rrset, 7572 struct auth_zone* z, struct auth_data* node) 7573 { 7574 if(rrset) { 7575 size_t j; 7576 for(j = 0; j<rrset->data->count; j++) { 7577 if(rrsig_rdata_get_type_covered(rrset->data-> 7578 rr_data[j], rrset->data->rr_len[j]) == 7579 LDNS_RR_TYPE_ZONEMD && 7580 query_dname_compare(z->name, node->name)==0) { 7581 /* omit RRSIGs over type ZONEMD at apex */ 7582 continue; 7583 } 7584 data->rr_len[*done] = rrset->data->rr_len[j]; 7585 data->rr_ttl[*done] = rrset->data->rr_ttl[j]; 7586 /* reference the rdata in the rrset, no need to 7587 * copy it, it is no longer need at the end of 7588 * the routine */ 7589 data->rr_data[*done] = rrset->data->rr_data[j]; 7590 (*done)++; 7591 } 7592 } 7593 } 7594 7595 /** collate the RRSIGs using the simple scheme */ 7596 static int zonemd_simple_rrsig(struct auth_zone* z, int hashalgo, 7597 struct secalgo_hash* h, struct auth_data* node, 7598 struct auth_rrset* rrset, struct auth_rrset** rrlist, size_t rrnum, 7599 struct regional* region, struct sldns_buffer* buf, char** reason) 7600 { 7601 /* the rrset pointer can be NULL, this means it is type RRSIG and 7602 * there is no ordinary type RRSIG there. The RRSIGs are stored 7603 * with the RRsets in their data. 7604 * 7605 * The RRset pointer can be nonNULL. This happens if there is 7606 * no RR that is covered by the RRSIG for the domain. Then this 7607 * RRSIG RR is stored in an rrset of type RRSIG. The other RRSIGs 7608 * are stored in the rrset entries for the RRs in the rr list for 7609 * the domain node. We need to collate the rrset's data, if any, and 7610 * the rrlist's rrsigs */ 7611 /* if this is the apex, omit RRSIGs that cover type ZONEMD */ 7612 /* build rrsig rrset */ 7613 size_t done = 0; 7614 struct ub_packed_rrset_key key; 7615 struct packed_rrset_data data; 7616 memset(&key, 0, sizeof(key)); 7617 memset(&data, 0, sizeof(data)); 7618 key.entry.key = &key; 7619 key.entry.data = &data; 7620 key.rk.dname = node->name; 7621 key.rk.dname_len = node->namelen; 7622 key.rk.type = htons(LDNS_RR_TYPE_RRSIG); 7623 key.rk.rrset_class = htons(z->dclass); 7624 data.count = zonemd_simple_count_rrsig(rrset, rrlist, rrnum, z, node); 7625 if(!zonemd_simple_rrsig_allocs(region, &data, data.count)) { 7626 *reason = "out of memory"; 7627 regional_free_all(region); 7628 return 0; 7629 } 7630 /* all the RRSIGs stored in the other rrsets for this domain node */ 7631 add_rrlist_rrsigs_into_data(&data, &done, rrlist, rrnum, z, node); 7632 /* plus the RRSIGs stored in an rrset of type RRSIG for this node */ 7633 add_rrset_into_data(&data, &done, rrset, z, node); 7634 7635 /* canonicalize */ 7636 if(!rrset_canonicalize_to_buffer(region, buf, &key)) { 7637 *reason = "out of memory"; 7638 regional_free_all(region); 7639 return 0; 7640 } 7641 regional_free_all(region); 7642 7643 /* hash */ 7644 if(!zonemd_digest_update(hashalgo, h, sldns_buffer_begin(buf), 7645 sldns_buffer_limit(buf), reason)) { 7646 return 0; 7647 } 7648 return 1; 7649 } 7650 7651 /** collate a domain's rrsets using the simple scheme */ 7652 static int zonemd_simple_domain(struct auth_zone* z, int hashalgo, 7653 struct secalgo_hash* h, struct auth_data* node, 7654 struct regional* region, struct sldns_buffer* buf, char** reason) 7655 { 7656 const size_t rrlistsize = 65536; 7657 struct auth_rrset* rrlist[rrlistsize]; 7658 size_t i, rrnum = 0; 7659 /* see if the domain is out of scope, the zone origin, 7660 * that would be omitted */ 7661 if(!dname_subdomain_c(node->name, z->name)) 7662 return 1; /* continue */ 7663 /* loop over the rrsets in ascending order. */ 7664 rrnum = authdata_rrsets_to_list(rrlist, rrlistsize, node->rrsets); 7665 addrrsigtype_if_needed(rrlist, rrlistsize, &rrnum, node); 7666 qsort(rrlist, rrnum, sizeof(*rrlist), rrlist_compare); 7667 for(i=0; i<rrnum; i++) { 7668 if(rrlist[i] && rrlist[i]->type == LDNS_RR_TYPE_ZONEMD && 7669 query_dname_compare(z->name, node->name) == 0) { 7670 /* omit type ZONEMD at apex */ 7671 continue; 7672 } 7673 if(rrlist[i] == NULL || rrlist[i]->type == 7674 LDNS_RR_TYPE_RRSIG) { 7675 if(!zonemd_simple_rrsig(z, hashalgo, h, node, 7676 rrlist[i], rrlist, rrnum, region, buf, reason)) 7677 return 0; 7678 } else if(!zonemd_simple_rrset(z, hashalgo, h, node, 7679 rrlist[i], region, buf, reason)) { 7680 return 0; 7681 } 7682 } 7683 return 1; 7684 } 7685 7686 /** collate the zone using the simple scheme */ 7687 static int zonemd_simple_collate(struct auth_zone* z, int hashalgo, 7688 struct secalgo_hash* h, struct regional* region, 7689 struct sldns_buffer* buf, char** reason) 7690 { 7691 /* our tree is sorted in canonical order, so we can just loop over 7692 * the tree */ 7693 struct auth_data* n; 7694 RBTREE_FOR(n, struct auth_data*, &z->data) { 7695 if(!zonemd_simple_domain(z, hashalgo, h, n, region, buf, 7696 reason)) 7697 return 0; 7698 } 7699 return 1; 7700 } 7701 7702 int auth_zone_generate_zonemd_hash(struct auth_zone* z, int scheme, 7703 int hashalgo, uint8_t* hash, size_t hashlen, size_t* resultlen, 7704 struct regional* region, struct sldns_buffer* buf, char** reason) 7705 { 7706 struct secalgo_hash* h = zonemd_digest_init(hashalgo, reason); 7707 if(!h) { 7708 if(!*reason) 7709 *reason = "digest init fail"; 7710 return 0; 7711 } 7712 if(scheme == ZONEMD_SCHEME_SIMPLE) { 7713 if(!zonemd_simple_collate(z, hashalgo, h, region, buf, reason)) { 7714 if(!*reason) *reason = "scheme simple collate fail"; 7715 secalgo_hash_delete(h); 7716 return 0; 7717 } 7718 } 7719 if(!zonemd_digest_finish(hashalgo, h, hash, hashlen, resultlen, 7720 reason)) { 7721 secalgo_hash_delete(h); 7722 *reason = "digest finish fail"; 7723 return 0; 7724 } 7725 secalgo_hash_delete(h); 7726 return 1; 7727 } 7728 7729 int auth_zone_generate_zonemd_check(struct auth_zone* z, int scheme, 7730 int hashalgo, uint8_t* hash, size_t hashlen, struct regional* region, 7731 struct sldns_buffer* buf, char** reason) 7732 { 7733 uint8_t gen[512]; 7734 size_t genlen = 0; 7735 *reason = NULL; 7736 if(!zonemd_hashalgo_supported(hashalgo)) { 7737 /* allow it */ 7738 *reason = "unsupported algorithm"; 7739 return 1; 7740 } 7741 if(!zonemd_scheme_supported(scheme)) { 7742 /* allow it */ 7743 *reason = "unsupported scheme"; 7744 return 1; 7745 } 7746 if(hashlen < 12) { 7747 /* the ZONEMD draft requires digests to fail if too small */ 7748 *reason = "digest length too small, less than 12"; 7749 return 0; 7750 } 7751 /* generate digest */ 7752 if(!auth_zone_generate_zonemd_hash(z, scheme, hashalgo, gen, 7753 sizeof(gen), &genlen, region, buf, reason)) { 7754 /* reason filled in by zonemd hash routine */ 7755 return 0; 7756 } 7757 /* check digest length */ 7758 if(hashlen != genlen) { 7759 *reason = "incorrect digest length"; 7760 if(verbosity >= VERB_ALGO) { 7761 verbose(VERB_ALGO, "zonemd scheme=%d hashalgo=%d", 7762 scheme, hashalgo); 7763 log_hex("ZONEMD should be ", gen, genlen); 7764 log_hex("ZONEMD to check is", hash, hashlen); 7765 } 7766 return 0; 7767 } 7768 /* check digest */ 7769 if(memcmp(hash, gen, genlen) != 0) { 7770 *reason = "incorrect digest"; 7771 if(verbosity >= VERB_ALGO) { 7772 verbose(VERB_ALGO, "zonemd scheme=%d hashalgo=%d", 7773 scheme, hashalgo); 7774 log_hex("ZONEMD should be ", gen, genlen); 7775 log_hex("ZONEMD to check is", hash, hashlen); 7776 } 7777 return 0; 7778 } 7779 return 1; 7780 } 7781 7782 /** log auth zone message with zone name in front. */ 7783 static void auth_zone_log(uint8_t* name, enum verbosity_value level, 7784 const char* format, ...) ATTR_FORMAT(printf, 3, 4); 7785 static void auth_zone_log(uint8_t* name, enum verbosity_value level, 7786 const char* format, ...) 7787 { 7788 va_list args; 7789 va_start(args, format); 7790 if(verbosity >= level) { 7791 char str[255+1]; 7792 char msg[MAXSYSLOGMSGLEN]; 7793 dname_str(name, str); 7794 vsnprintf(msg, sizeof(msg), format, args); 7795 verbose(level, "auth zone %s %s", str, msg); 7796 } 7797 va_end(args); 7798 } 7799 7800 /** ZONEMD, dnssec verify the rrset with the dnskey */ 7801 static int zonemd_dnssec_verify_rrset(struct auth_zone* z, 7802 struct module_env* env, struct module_stack* mods, 7803 struct ub_packed_rrset_key* dnskey, struct auth_data* node, 7804 struct auth_rrset* rrset, char** why_bogus, uint8_t* sigalg, 7805 char* reasonbuf, size_t reasonlen) 7806 { 7807 struct ub_packed_rrset_key pk; 7808 enum sec_status sec; 7809 struct val_env* ve; 7810 int m; 7811 int verified = 0; 7812 m = modstack_find(mods, "validator"); 7813 if(m == -1) { 7814 auth_zone_log(z->name, VERB_ALGO, "zonemd dnssec verify: have " 7815 "DNSKEY chain of trust, but no validator module"); 7816 return 0; 7817 } 7818 ve = (struct val_env*)env->modinfo[m]; 7819 7820 memset(&pk, 0, sizeof(pk)); 7821 pk.entry.key = &pk; 7822 pk.entry.data = rrset->data; 7823 pk.rk.dname = node->name; 7824 pk.rk.dname_len = node->namelen; 7825 pk.rk.type = htons(rrset->type); 7826 pk.rk.rrset_class = htons(z->dclass); 7827 if(verbosity >= VERB_ALGO) { 7828 char typestr[32]; 7829 typestr[0]=0; 7830 sldns_wire2str_type_buf(rrset->type, typestr, sizeof(typestr)); 7831 auth_zone_log(z->name, VERB_ALGO, 7832 "zonemd: verify %s RRset with DNSKEY", typestr); 7833 } 7834 sec = dnskeyset_verify_rrset(env, ve, &pk, dnskey, sigalg, why_bogus, NULL, 7835 LDNS_SECTION_ANSWER, NULL, &verified, reasonbuf, reasonlen); 7836 if(sec == sec_status_secure) { 7837 return 1; 7838 } 7839 if(why_bogus) 7840 auth_zone_log(z->name, VERB_ALGO, "DNSSEC verify was bogus: %s", *why_bogus); 7841 return 0; 7842 } 7843 7844 /** check for nsec3, the RR with params equal, if bitmap has the type */ 7845 static int nsec3_of_param_has_type(struct auth_rrset* nsec3, int algo, 7846 size_t iter, uint8_t* salt, size_t saltlen, uint16_t rrtype) 7847 { 7848 int i, count = (int)nsec3->data->count; 7849 struct ub_packed_rrset_key pk; 7850 memset(&pk, 0, sizeof(pk)); 7851 pk.entry.data = nsec3->data; 7852 for(i=0; i<count; i++) { 7853 int rralgo; 7854 size_t rriter, rrsaltlen; 7855 uint8_t* rrsalt; 7856 if(!nsec3_get_params(&pk, i, &rralgo, &rriter, &rrsalt, 7857 &rrsaltlen)) 7858 continue; /* no parameters, malformed */ 7859 if(rralgo != algo || rriter != iter || rrsaltlen != saltlen) 7860 continue; /* different parameters */ 7861 if(saltlen != 0) { 7862 if(rrsalt == NULL || salt == NULL) 7863 continue; 7864 if(memcmp(rrsalt, salt, saltlen) != 0) 7865 continue; /* different salt parameters */ 7866 } 7867 if(nsec3_has_type(&pk, i, rrtype)) 7868 return 1; 7869 } 7870 return 0; 7871 } 7872 7873 /** Verify the absence of ZONEMD with DNSSEC by checking NSEC, NSEC3 type flag. 7874 * return false on failure, reason contains description of failure. */ 7875 static int zonemd_check_dnssec_absence(struct auth_zone* z, 7876 struct module_env* env, struct module_stack* mods, 7877 struct ub_packed_rrset_key* dnskey, struct auth_data* apex, 7878 char** reason, char** why_bogus, uint8_t* sigalg, char* reasonbuf, 7879 size_t reasonlen) 7880 { 7881 struct auth_rrset* nsec = NULL; 7882 if(!apex) { 7883 *reason = "zone has no apex domain but ZONEMD missing"; 7884 return 0; 7885 } 7886 nsec = az_domain_rrset(apex, LDNS_RR_TYPE_NSEC); 7887 if(nsec) { 7888 struct ub_packed_rrset_key pk; 7889 /* dnssec verify the NSEC */ 7890 if(!zonemd_dnssec_verify_rrset(z, env, mods, dnskey, apex, 7891 nsec, why_bogus, sigalg, reasonbuf, reasonlen)) { 7892 *reason = "DNSSEC verify failed for NSEC RRset"; 7893 return 0; 7894 } 7895 /* check type bitmap */ 7896 memset(&pk, 0, sizeof(pk)); 7897 pk.entry.data = nsec->data; 7898 if(nsec_has_type(&pk, LDNS_RR_TYPE_ZONEMD)) { 7899 *reason = "DNSSEC NSEC bitmap says type ZONEMD exists"; 7900 return 0; 7901 } 7902 auth_zone_log(z->name, VERB_ALGO, "zonemd DNSSEC NSEC verification of absence of ZONEMD secure"); 7903 } else { 7904 /* NSEC3 perhaps ? */ 7905 int algo; 7906 size_t iter, saltlen; 7907 uint8_t* salt; 7908 struct auth_rrset* nsec3param = az_domain_rrset(apex, 7909 LDNS_RR_TYPE_NSEC3PARAM); 7910 struct auth_data* match; 7911 struct auth_rrset* nsec3; 7912 if(!nsec3param) { 7913 *reason = "zone has no NSEC information but ZONEMD missing"; 7914 return 0; 7915 } 7916 if(!az_nsec3_param(z, &algo, &iter, &salt, &saltlen)) { 7917 *reason = "zone has no NSEC information but ZONEMD missing"; 7918 return 0; 7919 } 7920 /* find the NSEC3 record */ 7921 match = az_nsec3_find_exact(z, z->name, z->namelen, algo, 7922 iter, salt, saltlen); 7923 if(!match) { 7924 *reason = "zone has no NSEC3 domain for the apex but ZONEMD missing"; 7925 return 0; 7926 } 7927 nsec3 = az_domain_rrset(match, LDNS_RR_TYPE_NSEC3); 7928 if(!nsec3) { 7929 *reason = "zone has no NSEC3 RRset for the apex but ZONEMD missing"; 7930 return 0; 7931 } 7932 /* dnssec verify the NSEC3 */ 7933 if(!zonemd_dnssec_verify_rrset(z, env, mods, dnskey, match, 7934 nsec3, why_bogus, sigalg, reasonbuf, reasonlen)) { 7935 *reason = "DNSSEC verify failed for NSEC3 RRset"; 7936 return 0; 7937 } 7938 /* check type bitmap */ 7939 if(nsec3_of_param_has_type(nsec3, algo, iter, salt, saltlen, 7940 LDNS_RR_TYPE_ZONEMD)) { 7941 *reason = "DNSSEC NSEC3 bitmap says type ZONEMD exists"; 7942 return 0; 7943 } 7944 auth_zone_log(z->name, VERB_ALGO, "zonemd DNSSEC NSEC3 verification of absence of ZONEMD secure"); 7945 } 7946 7947 return 1; 7948 } 7949 7950 /** Verify the SOA and ZONEMD DNSSEC signatures. 7951 * return false on failure, reason contains description of failure. */ 7952 static int zonemd_check_dnssec_soazonemd(struct auth_zone* z, 7953 struct module_env* env, struct module_stack* mods, 7954 struct ub_packed_rrset_key* dnskey, struct auth_data* apex, 7955 struct auth_rrset* zonemd_rrset, char** reason, char** why_bogus, 7956 uint8_t* sigalg, char* reasonbuf, size_t reasonlen) 7957 { 7958 struct auth_rrset* soa; 7959 if(!apex) { 7960 *reason = "zone has no apex domain"; 7961 return 0; 7962 } 7963 soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA); 7964 if(!soa) { 7965 *reason = "zone has no SOA RRset"; 7966 return 0; 7967 } 7968 if(!zonemd_dnssec_verify_rrset(z, env, mods, dnskey, apex, soa, 7969 why_bogus, sigalg, reasonbuf, reasonlen)) { 7970 *reason = "DNSSEC verify failed for SOA RRset"; 7971 return 0; 7972 } 7973 if(!zonemd_dnssec_verify_rrset(z, env, mods, dnskey, apex, 7974 zonemd_rrset, why_bogus, sigalg, reasonbuf, reasonlen)) { 7975 *reason = "DNSSEC verify failed for ZONEMD RRset"; 7976 return 0; 7977 } 7978 auth_zone_log(z->name, VERB_ALGO, "zonemd DNSSEC verification of SOA and ZONEMD RRsets secure"); 7979 return 1; 7980 } 7981 7982 /** 7983 * Fail the ZONEMD verification. 7984 * @param z: auth zone that fails. 7985 * @param env: environment with config, to ignore failure or not. 7986 * @param reason: failure string description. 7987 * @param why_bogus: failure string for DNSSEC verification failure. 7988 * @param result: strdup result in here if not NULL. 7989 */ 7990 static void auth_zone_zonemd_fail(struct auth_zone* z, struct module_env* env, 7991 char* reason, char* why_bogus, char** result) 7992 { 7993 char zstr[255+1]; 7994 /* if fail: log reason, and depending on config also take action 7995 * and drop the zone, eg. it is gone from memory, set zone_expired */ 7996 dname_str(z->name, zstr); 7997 if(!reason) reason = "verification failed"; 7998 if(result) { 7999 if(why_bogus) { 8000 char res[1024]; 8001 snprintf(res, sizeof(res), "%s: %s", reason, 8002 why_bogus); 8003 *result = strdup(res); 8004 } else { 8005 *result = strdup(reason); 8006 } 8007 if(!*result) log_err("out of memory"); 8008 } else { 8009 log_warn("auth zone %s: ZONEMD verification failed: %s", zstr, reason); 8010 } 8011 8012 if(env->cfg->zonemd_permissive_mode) { 8013 verbose(VERB_ALGO, "zonemd-permissive-mode enabled, " 8014 "not blocking zone %s", zstr); 8015 return; 8016 } 8017 8018 /* expired means the zone gives servfail and is not used by 8019 * lookup if fallback_enabled*/ 8020 z->zone_expired = 1; 8021 } 8022 8023 /** 8024 * Verify the zonemd with DNSSEC and hash check, with given key. 8025 * @param z: auth zone. 8026 * @param env: environment with config and temp buffers. 8027 * @param mods: module stack with validator env for verification. 8028 * @param dnskey: dnskey that we can use, or NULL. If nonnull, the key 8029 * has been verified and is the start of the chain of trust. 8030 * @param is_insecure: if true, the dnskey is not used, the zone is insecure. 8031 * And dnssec is not used. It is DNSSEC secure insecure or not under 8032 * a trust anchor. 8033 * @param sigalg: if nonNULL provide algorithm downgrade protection. 8034 * Otherwise one algorithm is enough. Must have space of ALGO_NEEDS_MAX+1. 8035 * @param result: if not NULL result reason copied here. 8036 */ 8037 static void 8038 auth_zone_verify_zonemd_with_key(struct auth_zone* z, struct module_env* env, 8039 struct module_stack* mods, struct ub_packed_rrset_key* dnskey, 8040 int is_insecure, char** result, uint8_t* sigalg) 8041 { 8042 char reasonbuf[256]; 8043 char* reason = NULL, *why_bogus = NULL; 8044 struct auth_data* apex = NULL; 8045 struct auth_rrset* zonemd_rrset = NULL; 8046 int zonemd_absent = 0, zonemd_absence_dnssecok = 0; 8047 8048 /* see if ZONEMD is present or absent. */ 8049 apex = az_find_name(z, z->name, z->namelen); 8050 if(!apex) { 8051 zonemd_absent = 1; 8052 } else { 8053 zonemd_rrset = az_domain_rrset(apex, LDNS_RR_TYPE_ZONEMD); 8054 if(!zonemd_rrset || zonemd_rrset->data->count==0) { 8055 zonemd_absent = 1; 8056 zonemd_rrset = NULL; 8057 } 8058 } 8059 8060 /* if no DNSSEC, done. */ 8061 /* if no ZONEMD, and DNSSEC, use DNSKEY to verify NSEC or NSEC3 for 8062 * zone apex. Check ZONEMD bit is turned off or else fail */ 8063 /* if ZONEMD, and DNSSEC, check DNSSEC signature on SOA and ZONEMD, 8064 * or else fail */ 8065 if(!dnskey && !is_insecure) { 8066 auth_zone_zonemd_fail(z, env, "DNSKEY missing", NULL, result); 8067 return; 8068 } else if(!zonemd_rrset && dnskey && !is_insecure) { 8069 /* fetch, DNSSEC verify, and check NSEC/NSEC3 */ 8070 if(!zonemd_check_dnssec_absence(z, env, mods, dnskey, apex, 8071 &reason, &why_bogus, sigalg, reasonbuf, 8072 sizeof(reasonbuf))) { 8073 auth_zone_zonemd_fail(z, env, reason, why_bogus, result); 8074 return; 8075 } 8076 zonemd_absence_dnssecok = 1; 8077 } else if(zonemd_rrset && dnskey && !is_insecure) { 8078 /* check DNSSEC verify of SOA and ZONEMD */ 8079 if(!zonemd_check_dnssec_soazonemd(z, env, mods, dnskey, apex, 8080 zonemd_rrset, &reason, &why_bogus, sigalg, reasonbuf, 8081 sizeof(reasonbuf))) { 8082 auth_zone_zonemd_fail(z, env, reason, why_bogus, result); 8083 return; 8084 } 8085 } 8086 8087 if(zonemd_absent && z->zonemd_reject_absence) { 8088 auth_zone_zonemd_fail(z, env, "ZONEMD absent and that is not allowed by config", NULL, result); 8089 return; 8090 } 8091 if(zonemd_absent && zonemd_absence_dnssecok) { 8092 auth_zone_log(z->name, VERB_ALGO, "DNSSEC verified nonexistence of ZONEMD"); 8093 if(result) { 8094 *result = strdup("DNSSEC verified nonexistence of ZONEMD"); 8095 if(!*result) log_err("out of memory"); 8096 } 8097 return; 8098 } 8099 if(zonemd_absent) { 8100 auth_zone_log(z->name, VERB_ALGO, "no ZONEMD present"); 8101 if(result) { 8102 *result = strdup("no ZONEMD present"); 8103 if(!*result) log_err("out of memory"); 8104 } 8105 return; 8106 } 8107 8108 /* check ZONEMD checksum and report or else fail. */ 8109 if(!auth_zone_zonemd_check_hash(z, env, &reason)) { 8110 auth_zone_zonemd_fail(z, env, reason, NULL, result); 8111 return; 8112 } 8113 8114 /* success! log the success */ 8115 if(reason) 8116 auth_zone_log(z->name, VERB_ALGO, "ZONEMD %s", reason); 8117 else auth_zone_log(z->name, VERB_ALGO, "ZONEMD verification successful"); 8118 if(result) { 8119 if(reason) 8120 *result = strdup(reason); 8121 else *result = strdup("ZONEMD verification successful"); 8122 if(!*result) log_err("out of memory"); 8123 } 8124 } 8125 8126 /** 8127 * verify the zone DNSKEY rrset from the trust anchor 8128 * This is possible because the anchor is for the zone itself, and can 8129 * thus apply straight to the zone DNSKEY set. 8130 * @param z: the auth zone. 8131 * @param env: environment with time and temp buffers. 8132 * @param mods: module stack for validator environment for dnssec validation. 8133 * @param anchor: trust anchor to use 8134 * @param is_insecure: returned, true if the zone is securely insecure. 8135 * @param why_bogus: if the routine fails, returns the failure reason. 8136 * @param keystorage: where to store the ub_packed_rrset_key that is created 8137 * on success. A pointer to it is returned on success. 8138 * @param reasonbuf: buffer to use for fail reason string print. 8139 * @param reasonlen: length of reasonbuf. 8140 * @return the dnskey RRset, reference to zone data and keystorage, or 8141 * NULL on failure. 8142 */ 8143 static struct ub_packed_rrset_key* 8144 zonemd_get_dnskey_from_anchor(struct auth_zone* z, struct module_env* env, 8145 struct module_stack* mods, struct trust_anchor* anchor, 8146 int* is_insecure, char** why_bogus, 8147 struct ub_packed_rrset_key* keystorage, char* reasonbuf, 8148 size_t reasonlen) 8149 { 8150 struct auth_data* apex; 8151 struct auth_rrset* dnskey_rrset; 8152 enum sec_status sec; 8153 struct val_env* ve; 8154 int m; 8155 8156 apex = az_find_name(z, z->name, z->namelen); 8157 if(!apex) { 8158 *why_bogus = "have trust anchor, but zone has no apex domain for DNSKEY"; 8159 return 0; 8160 } 8161 dnskey_rrset = az_domain_rrset(apex, LDNS_RR_TYPE_DNSKEY); 8162 if(!dnskey_rrset || dnskey_rrset->data->count==0) { 8163 *why_bogus = "have trust anchor, but zone has no DNSKEY"; 8164 return 0; 8165 } 8166 8167 m = modstack_find(mods, "validator"); 8168 if(m == -1) { 8169 *why_bogus = "have trust anchor, but no validator module"; 8170 return 0; 8171 } 8172 ve = (struct val_env*)env->modinfo[m]; 8173 8174 memset(keystorage, 0, sizeof(*keystorage)); 8175 keystorage->entry.key = keystorage; 8176 keystorage->entry.data = dnskey_rrset->data; 8177 keystorage->rk.dname = apex->name; 8178 keystorage->rk.dname_len = apex->namelen; 8179 keystorage->rk.type = htons(LDNS_RR_TYPE_DNSKEY); 8180 keystorage->rk.rrset_class = htons(z->dclass); 8181 auth_zone_log(z->name, VERB_QUERY, 8182 "zonemd: verify DNSKEY RRset with trust anchor"); 8183 sec = val_verify_DNSKEY_with_TA(env, ve, keystorage, anchor->ds_rrset, 8184 anchor->dnskey_rrset, NULL, why_bogus, NULL, NULL, reasonbuf, 8185 reasonlen); 8186 regional_free_all(env->scratch); 8187 if(sec == sec_status_secure) { 8188 /* success */ 8189 *is_insecure = 0; 8190 return keystorage; 8191 } else if(sec == sec_status_insecure) { 8192 /* insecure */ 8193 *is_insecure = 1; 8194 } else { 8195 /* bogus */ 8196 *is_insecure = 0; 8197 auth_zone_log(z->name, VERB_ALGO, 8198 "zonemd: verify DNSKEY RRset with trust anchor failed: %s", *why_bogus); 8199 } 8200 return NULL; 8201 } 8202 8203 /** verify the DNSKEY from the zone with looked up DS record */ 8204 static struct ub_packed_rrset_key* 8205 auth_zone_verify_zonemd_key_with_ds(struct auth_zone* z, 8206 struct module_env* env, struct module_stack* mods, 8207 struct ub_packed_rrset_key* ds, int* is_insecure, char** why_bogus, 8208 struct ub_packed_rrset_key* keystorage, uint8_t* sigalg, 8209 char* reasonbuf, size_t reasonlen) 8210 { 8211 struct auth_data* apex; 8212 struct auth_rrset* dnskey_rrset; 8213 enum sec_status sec; 8214 struct val_env* ve; 8215 int m; 8216 8217 /* fetch DNSKEY from zone data */ 8218 apex = az_find_name(z, z->name, z->namelen); 8219 if(!apex) { 8220 *why_bogus = "in verifywithDS, zone has no apex"; 8221 return NULL; 8222 } 8223 dnskey_rrset = az_domain_rrset(apex, LDNS_RR_TYPE_DNSKEY); 8224 if(!dnskey_rrset || dnskey_rrset->data->count==0) { 8225 *why_bogus = "in verifywithDS, zone has no DNSKEY"; 8226 return NULL; 8227 } 8228 8229 m = modstack_find(mods, "validator"); 8230 if(m == -1) { 8231 *why_bogus = "in verifywithDS, have no validator module"; 8232 return NULL; 8233 } 8234 ve = (struct val_env*)env->modinfo[m]; 8235 8236 memset(keystorage, 0, sizeof(*keystorage)); 8237 keystorage->entry.key = keystorage; 8238 keystorage->entry.data = dnskey_rrset->data; 8239 keystorage->rk.dname = apex->name; 8240 keystorage->rk.dname_len = apex->namelen; 8241 keystorage->rk.type = htons(LDNS_RR_TYPE_DNSKEY); 8242 keystorage->rk.rrset_class = htons(z->dclass); 8243 auth_zone_log(z->name, VERB_QUERY, "zonemd: verify zone DNSKEY with DS"); 8244 sec = val_verify_DNSKEY_with_DS(env, ve, keystorage, ds, sigalg, 8245 why_bogus, NULL, NULL, reasonbuf, reasonlen); 8246 regional_free_all(env->scratch); 8247 if(sec == sec_status_secure) { 8248 /* success */ 8249 return keystorage; 8250 } else if(sec == sec_status_insecure) { 8251 /* insecure */ 8252 *is_insecure = 1; 8253 } else { 8254 /* bogus */ 8255 *is_insecure = 0; 8256 if(*why_bogus == NULL) 8257 *why_bogus = "verify failed"; 8258 auth_zone_log(z->name, VERB_ALGO, 8259 "zonemd: verify DNSKEY RRset with DS failed: %s", 8260 *why_bogus); 8261 } 8262 return NULL; 8263 } 8264 8265 /** callback for ZONEMD lookup of DNSKEY */ 8266 void auth_zonemd_dnskey_lookup_callback(void* arg, int rcode, sldns_buffer* buf, 8267 enum sec_status sec, char* why_bogus, int ATTR_UNUSED(was_ratelimited)) 8268 { 8269 struct auth_zone* z = (struct auth_zone*)arg; 8270 struct module_env* env; 8271 char reasonbuf[256]; 8272 char* reason = NULL, *ds_bogus = NULL, *typestr="DNSKEY"; 8273 struct ub_packed_rrset_key* dnskey = NULL, *ds = NULL; 8274 int is_insecure = 0, downprot; 8275 struct ub_packed_rrset_key keystorage; 8276 uint8_t sigalg[ALGO_NEEDS_MAX+1]; 8277 8278 lock_rw_wrlock(&z->lock); 8279 env = z->zonemd_callback_env; 8280 /* release the env variable so another worker can pick up the 8281 * ZONEMD verification task if it wants to */ 8282 z->zonemd_callback_env = NULL; 8283 if(!env || env->outnet->want_to_quit || z->zone_deleted) { 8284 lock_rw_unlock(&z->lock); 8285 return; /* stop on quit */ 8286 } 8287 if(z->zonemd_callback_qtype == LDNS_RR_TYPE_DS) 8288 typestr = "DS"; 8289 downprot = env->cfg->harden_algo_downgrade; 8290 8291 /* process result */ 8292 if(sec == sec_status_bogus) { 8293 reason = why_bogus; 8294 if(!reason) { 8295 if(z->zonemd_callback_qtype == LDNS_RR_TYPE_DNSKEY) 8296 reason = "lookup of DNSKEY was bogus"; 8297 else reason = "lookup of DS was bogus"; 8298 } 8299 auth_zone_log(z->name, VERB_ALGO, 8300 "zonemd lookup of %s was bogus: %s", typestr, reason); 8301 } else if(rcode == LDNS_RCODE_NOERROR) { 8302 uint16_t wanted_qtype = z->zonemd_callback_qtype; 8303 struct regional* temp = env->scratch; 8304 struct query_info rq; 8305 struct reply_info* rep; 8306 memset(&rq, 0, sizeof(rq)); 8307 rep = parse_reply_in_temp_region(buf, temp, &rq); 8308 if(rep && rq.qtype == wanted_qtype && 8309 query_dname_compare(z->name, rq.qname) == 0 && 8310 FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NOERROR) { 8311 /* parsed successfully */ 8312 struct ub_packed_rrset_key* answer = 8313 reply_find_answer_rrset(&rq, rep); 8314 if(answer && sec == sec_status_secure) { 8315 if(z->zonemd_callback_qtype == LDNS_RR_TYPE_DNSKEY) 8316 dnskey = answer; 8317 else ds = answer; 8318 auth_zone_log(z->name, VERB_ALGO, 8319 "zonemd lookup of %s was secure", typestr); 8320 } else if(sec == sec_status_secure && !answer) { 8321 is_insecure = 1; 8322 auth_zone_log(z->name, VERB_ALGO, 8323 "zonemd lookup of %s has no content, but is secure, treat as insecure", typestr); 8324 } else if(sec == sec_status_insecure) { 8325 is_insecure = 1; 8326 auth_zone_log(z->name, VERB_ALGO, 8327 "zonemd lookup of %s was insecure", typestr); 8328 } else if(sec == sec_status_indeterminate) { 8329 is_insecure = 1; 8330 auth_zone_log(z->name, VERB_ALGO, 8331 "zonemd lookup of %s was indeterminate, treat as insecure", typestr); 8332 } else { 8333 auth_zone_log(z->name, VERB_ALGO, 8334 "zonemd lookup of %s has nodata", typestr); 8335 if(z->zonemd_callback_qtype == LDNS_RR_TYPE_DNSKEY) 8336 reason = "lookup of DNSKEY has nodata"; 8337 else reason = "lookup of DS has nodata"; 8338 } 8339 } else if(rep && rq.qtype == wanted_qtype && 8340 query_dname_compare(z->name, rq.qname) == 0 && 8341 FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NXDOMAIN && 8342 sec == sec_status_secure) { 8343 /* secure nxdomain, so the zone is like some RPZ zone 8344 * that does not exist in the wider internet, with 8345 * a secure nxdomain answer outside of it. So we 8346 * treat the zonemd zone without a dnssec chain of 8347 * trust, as insecure. */ 8348 is_insecure = 1; 8349 auth_zone_log(z->name, VERB_ALGO, 8350 "zonemd lookup of %s was secure NXDOMAIN, treat as insecure", typestr); 8351 } else if(rep && rq.qtype == wanted_qtype && 8352 query_dname_compare(z->name, rq.qname) == 0 && 8353 FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NXDOMAIN && 8354 sec == sec_status_insecure) { 8355 is_insecure = 1; 8356 auth_zone_log(z->name, VERB_ALGO, 8357 "zonemd lookup of %s was insecure NXDOMAIN, treat as insecure", typestr); 8358 } else if(rep && rq.qtype == wanted_qtype && 8359 query_dname_compare(z->name, rq.qname) == 0 && 8360 FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NXDOMAIN && 8361 sec == sec_status_indeterminate) { 8362 is_insecure = 1; 8363 auth_zone_log(z->name, VERB_ALGO, 8364 "zonemd lookup of %s was indeterminate NXDOMAIN, treat as insecure", typestr); 8365 } else { 8366 auth_zone_log(z->name, VERB_ALGO, 8367 "zonemd lookup of %s has no answer", typestr); 8368 if(z->zonemd_callback_qtype == LDNS_RR_TYPE_DNSKEY) 8369 reason = "lookup of DNSKEY has no answer"; 8370 else reason = "lookup of DS has no answer"; 8371 } 8372 } else { 8373 auth_zone_log(z->name, VERB_ALGO, 8374 "zonemd lookup of %s failed", typestr); 8375 if(z->zonemd_callback_qtype == LDNS_RR_TYPE_DNSKEY) 8376 reason = "lookup of DNSKEY failed"; 8377 else reason = "lookup of DS failed"; 8378 } 8379 8380 if(!reason && !is_insecure && !dnskey && ds) { 8381 dnskey = auth_zone_verify_zonemd_key_with_ds(z, env, 8382 &env->mesh->mods, ds, &is_insecure, &ds_bogus, 8383 &keystorage, downprot?sigalg:NULL, reasonbuf, 8384 sizeof(reasonbuf)); 8385 if(!dnskey && !is_insecure && !reason) 8386 reason = "DNSKEY verify with DS failed"; 8387 } 8388 8389 if(reason) { 8390 auth_zone_zonemd_fail(z, env, reason, ds_bogus, NULL); 8391 lock_rw_unlock(&z->lock); 8392 regional_free_all(env->scratch); 8393 return; 8394 } 8395 8396 auth_zone_verify_zonemd_with_key(z, env, &env->mesh->mods, dnskey, 8397 is_insecure, NULL, downprot?sigalg:NULL); 8398 regional_free_all(env->scratch); 8399 lock_rw_unlock(&z->lock); 8400 } 8401 8402 /** lookup DNSKEY for ZONEMD verification */ 8403 static int 8404 zonemd_lookup_dnskey(struct auth_zone* z, struct module_env* env) 8405 { 8406 struct query_info qinfo; 8407 uint16_t qflags = BIT_RD; 8408 struct edns_data edns; 8409 sldns_buffer* buf = env->scratch_buffer; 8410 int fetch_ds = 0; 8411 8412 if(!z->fallback_enabled) { 8413 /* we cannot actually get the DNSKEY, because it is in the 8414 * zone we have ourselves, and it is not served yet 8415 * (possibly), so fetch type DS */ 8416 fetch_ds = 1; 8417 } 8418 if(z->zonemd_callback_env) { 8419 /* another worker is already working on the callback 8420 * for the DNSKEY lookup for ZONEMD verification. 8421 * We do not also have to do ZONEMD verification, let that 8422 * worker do it */ 8423 auth_zone_log(z->name, VERB_ALGO, 8424 "zonemd needs lookup of %s and that already is worked on by another worker", (fetch_ds?"DS":"DNSKEY")); 8425 return 1; 8426 } 8427 8428 /* use mesh_new_callback to lookup the DNSKEY, 8429 * and then wait for them to be looked up (in cache, or query) */ 8430 qinfo.qname_len = z->namelen; 8431 qinfo.qname = z->name; 8432 qinfo.qclass = z->dclass; 8433 if(fetch_ds) 8434 qinfo.qtype = LDNS_RR_TYPE_DS; 8435 else qinfo.qtype = LDNS_RR_TYPE_DNSKEY; 8436 qinfo.local_alias = NULL; 8437 if(verbosity >= VERB_ALGO) { 8438 char buf1[512]; 8439 char buf2[LDNS_MAX_DOMAINLEN+1]; 8440 dname_str(z->name, buf2); 8441 snprintf(buf1, sizeof(buf1), "auth zone %s: lookup %s " 8442 "for zonemd verification", buf2, 8443 (fetch_ds?"DS":"DNSKEY")); 8444 log_query_info(VERB_ALGO, buf1, &qinfo); 8445 } 8446 edns.edns_present = 1; 8447 edns.ext_rcode = 0; 8448 edns.edns_version = 0; 8449 edns.bits = EDNS_DO; 8450 edns.opt_list_in = NULL; 8451 edns.opt_list_out = NULL; 8452 edns.opt_list_inplace_cb_out = NULL; 8453 if(sldns_buffer_capacity(buf) < 65535) 8454 edns.udp_size = (uint16_t)sldns_buffer_capacity(buf); 8455 else edns.udp_size = 65535; 8456 8457 /* store the worker-specific module env for the callback. 8458 * We can then reference this when the callback executes */ 8459 z->zonemd_callback_env = env; 8460 z->zonemd_callback_qtype = qinfo.qtype; 8461 /* the callback can be called straight away */ 8462 lock_rw_unlock(&z->lock); 8463 if(!mesh_new_callback(env->mesh, &qinfo, qflags, &edns, buf, 0, 8464 &auth_zonemd_dnskey_lookup_callback, z, 0)) { 8465 lock_rw_wrlock(&z->lock); 8466 log_err("out of memory lookup of %s for zonemd", 8467 (fetch_ds?"DS":"DNSKEY")); 8468 return 0; 8469 } 8470 lock_rw_wrlock(&z->lock); 8471 return 1; 8472 } 8473 8474 void auth_zone_verify_zonemd(struct auth_zone* z, struct module_env* env, 8475 struct module_stack* mods, char** result, int offline, int only_online) 8476 { 8477 char reasonbuf[256]; 8478 char* reason = NULL, *why_bogus = NULL; 8479 struct trust_anchor* anchor = NULL; 8480 struct ub_packed_rrset_key* dnskey = NULL; 8481 struct ub_packed_rrset_key keystorage; 8482 int is_insecure = 0; 8483 /* verify the ZONEMD if present. 8484 * If not present check if absence is allowed by DNSSEC */ 8485 if(!z->zonemd_check) 8486 return; 8487 if(z->data.count == 0) 8488 return; /* no data */ 8489 8490 /* if zone is under a trustanchor */ 8491 /* is it equal to trustanchor - get dnskey's verified */ 8492 /* else, find chain of trust by fetching DNSKEYs lookup for zone */ 8493 /* result if that, if insecure, means no DNSSEC for the ZONEMD, 8494 * otherwise we have the zone DNSKEY for the DNSSEC verification. */ 8495 if(env->anchors) 8496 anchor = anchors_lookup(env->anchors, z->name, z->namelen, 8497 z->dclass); 8498 if(anchor && anchor->numDS == 0 && anchor->numDNSKEY == 0) { 8499 /* domain-insecure trust anchor for unsigned zones */ 8500 lock_basic_unlock(&anchor->lock); 8501 if(only_online) 8502 return; 8503 dnskey = NULL; 8504 is_insecure = 1; 8505 } else if(anchor && query_dname_compare(z->name, anchor->name) == 0) { 8506 if(only_online) { 8507 lock_basic_unlock(&anchor->lock); 8508 return; 8509 } 8510 /* equal to trustanchor, no need for online lookups */ 8511 dnskey = zonemd_get_dnskey_from_anchor(z, env, mods, anchor, 8512 &is_insecure, &why_bogus, &keystorage, reasonbuf, 8513 sizeof(reasonbuf)); 8514 lock_basic_unlock(&anchor->lock); 8515 if(!dnskey && !reason && !is_insecure) { 8516 reason = "verify DNSKEY RRset with trust anchor failed"; 8517 } 8518 } else if(anchor) { 8519 lock_basic_unlock(&anchor->lock); 8520 /* perform online lookups */ 8521 if(offline) 8522 return; 8523 /* setup online lookups, and wait for them */ 8524 if(zonemd_lookup_dnskey(z, env)) { 8525 /* wait for the lookup */ 8526 return; 8527 } 8528 reason = "could not lookup DNSKEY for chain of trust"; 8529 } else { 8530 /* the zone is not under a trust anchor */ 8531 if(only_online) 8532 return; 8533 dnskey = NULL; 8534 is_insecure = 1; 8535 } 8536 8537 if(reason) { 8538 auth_zone_zonemd_fail(z, env, reason, why_bogus, result); 8539 regional_free_all(env->scratch); 8540 return; 8541 } 8542 8543 auth_zone_verify_zonemd_with_key(z, env, mods, dnskey, is_insecure, 8544 result, NULL); 8545 regional_free_all(env->scratch); 8546 } 8547 8548 void auth_zones_pickup_zonemd_verify(struct auth_zones* az, 8549 struct module_env* env) 8550 { 8551 struct auth_zone key; 8552 uint8_t savezname[255+1]; 8553 size_t savezname_len; 8554 struct auth_zone* z; 8555 key.node.key = &key; 8556 lock_rw_rdlock(&az->lock); 8557 RBTREE_FOR(z, struct auth_zone*, &az->ztree) { 8558 lock_rw_wrlock(&z->lock); 8559 if(!z->zonemd_check) { 8560 lock_rw_unlock(&z->lock); 8561 continue; 8562 } 8563 key.dclass = z->dclass; 8564 key.namelabs = z->namelabs; 8565 if(z->namelen > sizeof(savezname)) { 8566 lock_rw_unlock(&z->lock); 8567 log_err("auth_zones_pickup_zonemd_verify: zone name too long"); 8568 continue; 8569 } 8570 savezname_len = z->namelen; 8571 memmove(savezname, z->name, z->namelen); 8572 lock_rw_unlock(&az->lock); 8573 auth_zone_verify_zonemd(z, env, &env->mesh->mods, NULL, 0, 1); 8574 lock_rw_unlock(&z->lock); 8575 lock_rw_rdlock(&az->lock); 8576 /* find the zone we had before, it is not deleted, 8577 * because we have a flag for that that is processed at 8578 * apply_cfg time */ 8579 key.namelen = savezname_len; 8580 key.name = savezname; 8581 z = (struct auth_zone*)rbtree_search(&az->ztree, &key); 8582 if(!z) 8583 break; 8584 } 8585 lock_rw_unlock(&az->lock); 8586 } 8587